The test itself is simple and painless, and only requires a urine sample. medications can result in false positives for these substances. Furthermore, if they can prove they are taking a medicine that can produce a false positive (by producing a legitimate prescription), the administrator may schedule another test 30 to 60 days later. Multiple medications can cause false positive results. Evaluation of the 20% D-methamphetamine requirement for determining illicit use of methamphetamine in urine. Drug tests are also performed in the workplace to identify illicit substance abuse. What can a urine drug screening immunoassay really tell us? It increases the levelsof naturally occurring dopamine and norepinephrine in the brain. Prepared by: Commonly prescribed medications and potential false-positive urine drug screens. Amanda Gerberich, PharmD, BCPS According to the Drug Abuse Warning Network, 6.6% of emergency department visits involving illicit drugs in 2009 were due to methamphetamine.. Hair drug testing can be used to determine drug abuse over a prolonged period of time, and also allows solicitors to establish a client's pattern of change. Many of the over-the-counter drugs that are used to treat ADD and ADHD have components that are similar to those found in methamphetamine 3.Ritalin, Adderall and Dexedrine may all cause someone to have a false-positive drug test for meth 1. Baby Soap. Rockville, MD: Substance Abuse and Mental Health Services Administration, 2011. http://www.samhsa.gov/data/2k11/dawn/2k9dawned/html/dawn2k9ed.htm. The references of each report describing a medication whose use was associated with false-positive UDS results were also reviewed. Hair strand drug tests detect the presence of drug metabolites in the follicle. Unauthorized use of these marks is strictly prohibited. 2012;12(10). In one study, 49 out of 50 patients taking the drug tested positive for benzodiazepines. No cross-reactivity was found for other . This has prompted restrictions on the distribution of these over-the-counter (OTC) medications. Hair: Trazodone metabolites may be stored in the hair shafts and show up for a maximum of 90 days, similar to other illegal drugs. 2016 Mar;40(2):97-107. doi: 10.1093/jat/bkv133. are commonly prescribed for certain infections (urinary tract, sinus, etc.). Esposito FM, Crumpton S, Mitchell J, Flegel RR. government site. Urine: Trazodone can show up in the urine for 5 to 26 days from the last use. A false-positive test result means that your drug test shows the presence of a medication or substance that you aren't actually taking. A positive methamphetamine test could be caused by use of an OTC product, a prescription drug, or illicit use (Table 1). The laboratory may run up to 3 distinct tests to produce a complete amphetamine profile. Correspondingly, it may lead to unnecessary investigation and treatment. Pseudoephedrine, the decongestant found in original Sudafed (the kind you have to sign for) can/will cause a false positive under one of those two test columns. that you have taken it.. If, under their physicians approval, the person can be off the medicine for that length of time, a negative test should result.. Additional factors such as drug interactions, dose and frequency intervals, chronic versus occasional use, and time of last ingestion can all affect the detection window. Epub 2017 Mar 18. Answer (1 of 5): Adderall will pop for amphetamine but not methamphetamine. Some examples include NSAIDs, dextromethorphan, and some antidepressants. The temperature of urine should be between 90 to 100 degrees Fahrenheit measured within 4 minutes of collection; the pH should be consistent with the range of 4.5 to 8; the specific gravity should be between 1.002 and 1.030; and the creatinine should be greater than 20 mg/dL. (SMA) 11-4659, DAWN Series D-35. 2014 Sep;38(7):387-96. doi: 10.1093/jat/bku075. Urine tests can detect more recent drug use, while hair follicle . Less commonly, antidepressants have been known to trigger false . "Our studies show that [the main targets in a hair test] can be present in hair of non . False-positive drug screens are commonly documented in case reports. Confirmatory tests are more timely and costly and are performed by highly trained laboratory personnel. Some point-of-care testing (POCT) devices may result in a false positive for amphetamines in patients who are taking certain prescription, over-the-counter, or illicit medications. Epub 2015 Nov 2. Aripiprazole causing false positive urine amphetamine drug screen in an adult patient with bipolar disorder. Mebeverine (Duspatalin Retard 200 mg), an antispasmodic drug, has been described to cause false-positive amphetamine tests. We recommend using the latest version of IE11, Edge, Chrome, Firefox or Safari. Common over-the-counter anti-inflammatory pain medications such as Advil (ibuprofen) and Aleve (naproxen) could make you test positive for barbiturates and THC (marijuana/cannabinoids); and ibuprofen can also make you test positive for PCP. Standridge JB, Adams SM, Zotos. Promethazine. 10 Kinetics Interaction of Microparticles in Solution (KIMS, Roche), a monoclonal antibody assay, identified possible false-positive results for chlorpromazine, clomipramine, and thioridazine. 2021 Nov 30;2021:7134394. doi: 10.1155/2021/7134394. If, under their physicians approval, the person can be off the medicine for that length of time, a negative test should result.. Prednisone What medications can cause a false positive for methamphetamines? Drug-free workplace guidelines and resources. Antihistamines and some sleep aids containing diphenhydramine (like Benadryl) could cause a false positive result for PCP or methadone. False positive results on urine drug tests can happen. Welcome to JA Thanks for the question, Well a variety of substances can cause false positive testing for Methapmhetamines, most of them include;-Ephedrine, pseudo ephedrine, propylephedrine, phenylephrine Phenegan-D, Robitussin Cold and Flu Asthma medications Kidney infection, kidney disease, Liver disease, diabetes Many other prescription medications like Dexedrine, amifepramone, clobenzorex . 1-3 It was prescribed to the patient for symptomatic treatment of irritable bowel syndrome. Prednisone is a corticosteroid that is detectable in your urine, so if you are taking the drug, it is possible that you will test positive for steroids. 2023 Jan 5;2023:4370648. doi: 10.1155/2023/4370648. used to treat hypertension and chest pain, may result in false positive drug test results for. yes it will show as a false positive in the drug screen urine test. Pseudoephedrine: Used for sinus and nasal congestion, pseudoephedrine (Sudafed) can be the cause of false positive tests for amphetamine or methamphetamine. They have been shown to. If you're taking labetalol, you could have a false positive test for amphetamine . Adderal Also causes a false positive methamphetamine test. Dr. M. Hytham Beck answered. In 1998, the DHHS increased the cutoff for opiates from 300 ng/mL to 2000 ng/mL to avoid false positive tests from poppy seed ingestion, as well as routine prescription drug use. The Adderall will show up as a false positive for Methamphetamines. Amphetamine positive urine toxicology screen secondary to atomoxetine. Category: Medical. Results are relatively rapid, and the test can screen for a wide variety of drug metabolites. Common ones include the EIA (Enzyme Linked Immunoassay) test and the CEDIA (Closed Enzyme Donor Immunoassay) test. Riboflavin, also known as B2, is found in hemp seed oil and may return a false THC (marijuana) reading. Urine drug testing screens for the presence of THC, the psychoactive component of marijuana, but a problem could arise due to the fact that these products are not very well-regulated and cross contamination can occur. Table 3 lists substances that may cause false-positive results on immunoassay urine drug screens; however, this list may not include all potential substances.2, 8-10 Positive immunoassay urine drug screens should be considered presumptive, and confirmed with GC-MS to rule out false-positives. What drugs are likely to interfere with urine drug screens? US Pharm. By identifying medications that contribute to false-negatives and false-positives . Cupp M. PL Detail-Document, urine drug testing. Purpose. If you believe you have a failed drug test due to taking a prescription drug or consuming one of these products, you do have options. This means you're not pregnant but the test says you are. Methamphetamine is a highly addictive and illegal psychostimulant drug that is similar to amphetamine. An otherwise healthy 27-year-old female with a history of attention deficit hyperactivity disorder (ADHD) treated with atomoxetine had an acute onset tonic-clonic seizure. If the patient does not have a prescription for a drug that would result in >20% d-methamphetamine, illicit use of a diverted prescription product or street methamphetamine should be considered as a source. https://doi.org/10.1016/s0196-0644(05)80433-0, Caricasole, V., Spagnolo, G., Di Bernardo, I., Cirnigliaro, G., Piccoli, E., & DellOsso, B. With increased dose or prolonged abuse (either binge or chronic), an individual may experience a set of secondary effects that may include increased anxiety, irritability, aggressiveness, paranoia . Accessed April 8, 2021. Amitriptyline. eCollection 2022. In addition to prescription medications, these other common substances can lead to a false positive drug test. Methamphetamine is illegal except when it is prescribed by a physician for a very limited number of medical conditions. Please enable it to take advantage of the complete set of features! It can show up as positive for meth on a drug test though. The medication Daypro (oxaprozin), which is prescribed for types of arthritis, may result in a false positive test for benzodiazepines. eCollection 2021 Oct. False-positive interferences of common urine drug screen immunoassays: a review. A retrospective chart review of 10,011 urine drug screens found that of 362 initial positive amphetamine tests, 128 (35%) were false positives. If it is an OTC product, have some kind of documentation (the container it was in, a note from your physician, etc.) In addition, benzphetamine (Didrex) is a schedule III medication approved for treatment of obesity. Thats because the chemical structure of phentermine is similar to that of an amphetamine, so if youre taking the drug, it is likely to appear as a positive result on a 5-panel urinalysis. ) There are many different over the counter and prescription medications that have been reported to cause false positives for methamphetamine on a drug test. 8600 Rockville Pike This step is nonspecific in that the reaction can be caused not only by amphetamines but also by other compounds with a similar molecular structure, phentermine being a classic example. During World War 2, methamphetamine similar in structure to amphetamine was usedto keep military personnel alert and to improve endurance and mood. Common over-the-counter anti-inflammatory pain medications such as. In rare cases, a false positive might occur, but it will be most likely within several hours of exposure. 2015;15(1). New York, NY: Pharmacia & Upjohn Company, a Division. Can tapentadol cause a false-positive urine drug screen for amphetamine? Updated March 1, 2021. For example, a methamphetamine test comes back positive for methamphetamines, even though you haven't taken any. These prescriptionsand other substancescan skew the results of a screen for illicit substances, Find out if caffeine interacts with these prescriptions for hypertension and heart problems. You could have a false-positive result if blood or protein is present in your urine. A false positive can potentially lead to a loss of employment, jail time, loss of privileges under probation, revocation of medical license, and exclusion from competitive sports. Amphetamines and methamphetamines are part of an important class of drugs included in most urine drugs of abuse screening panels, and a common assay to detect these drugs is the Amphetamines II immunoassay (Roche Diagnostics). 2011 Jun;7(2):105-8. doi: 10.1007/s13181-010-0131-5. WebMD.com says between 5 - 10% of people will fail due to a false positive drug test. Quinolone antibiotics, such as Levaquin (levofloxacin) or Cipro (ciprofloxacin) are commonly prescribed for certain infections (urinary tract, sinus, etc.). If youre taking labetalol, you could have a false positive test for amphetamine, methamphetamine, or LSD. Toxicology. Abstract and Figures. Labetalol can also cause a false positive for amphetamine or methamphetamine because a labetalol metabolite is structurally similar to amphetamine. 5-7 Non-amphetamine prescription, illicit, or over-the-counter . To quote a study published in the Journal of Clinical Biochemistry, " commonly used soap and wash products used for newborn and infant care as potential causes of false positive THC screening results .". With a valid prescription, an appointed Medical Review Officer (MRO) can rule out false positives. FOIA Similarly, gabapentin is very unlikely to cause a false positive for other drugs. Centers for Disease Control and Prevention (CDC). While urine drug screening using immunoassay is convenient, the test is associated with multiple limitations. This Is The Industries Dirty Little Secret. [PMID 23088194] Follow me on Twitter . Additionally, a thorough medication history should be obtained to anticipate false-positive results. Drugs.com provides accurate and independent information on more than 24,000 prescription drugs, over-the-counter medicines and natural products. The U.S. Department of Health and Human Services (DHHS) standardized these cutoff values for drug testing in the workplace (Table 1).3,4 A negative test result using these values does not represent the absence of drug use, and false-negatives can occur.2 Lower thresholds may be used in clinical settings, as the cutoff values defined by the DHHS are higher and intended for the workplace. Conclusion. Usually, an immunoassay screening test for methamphetamine is a methamphetamine/amphetamine combined test, so will detect any medication or substance that resembles methamphetamine OR amphetamine. Updated: 6:28 PM MDT May 25, 2016. Cold remedies, hay fever remedies, nasal decongestants, diet pills, fluoxetine (Prozac), methylphenidate (Ritalin), bupropion (Wellbutrin), beta blockers (blood-pressure remedies) Barbiturates. This might look like someone used illegal drugs (such as methamphetamines or opiates) when they did not. Although this is not a high percentage, the consequences for failing a drug test could jeopardize your career, education, or job prospects. Does Zantac (ranitidine) cause false positives for methamphetamine? Certain antidepressant drugs are more prone to false-positive readings. Methamphetamine Information for Consumers, Methamphetamine Information for Healthcare Professionals, DMAA (1,3-dimethylamylamine), found in some dietary and weight-loss supplements, DeGeorge, Jr. M, Weber J. Methamphetamine Urine Toxicology: An In-depth Review. Using current methodology for urine toxicology testing will allow clinicians to narrow down the possible source of a positive result and assist them in managing their patients accordingly. However, IA drug screens have limited sensitivity and specificity due in part to capture antibody cross-reactivity with structurally similar interfering compounds, producing false-positive results. Thats because common. Learn how we can help. Subscribe to Drugs.com newsletters for the latest medication news, new drug approvals, alerts and updates. He's answered thousands of medication and pharmacy-related questions and he's ready to answer yours! you should drink of water per day. Thats because the chemical structure of phentermine is similar to that of an amphetamine, so if youre taking the drug, it is likely to appear as a positive result on a 5-panel urinalysis. 3. The information presented is current as April 5, 2021. If only amphetamine is detected, once again no further testing is needed. suggests that 10% to 15% of drug tests yield false negative results. When consumed in large quantities (such as in a poppy seed bagel or muffin), the tiny black seeds might cause a false positive drug result for opioids. Can poppy seeds make you fail a drug test? U.S. Pharmacist. The main issue is the tests themselves. I would appreciate it if you please leave a five star rating at the top left part of your screen, since this is the only way I have tank credit for this answer. Last updated on Aug 18, 2022. Mandatory guidelines for federal workplace drug testing programs. The PubMed wordmark and PubMed logo are registered trademarks of the U.S. Department of Health and Human Services (HHS). 1. Safdari KM, Converse C, Dong F, MacDougall NA, Hyer K, Runyon A, Ahlering H, Comunale ME. Brief Summary: Background: - Some legal over-the-counter drugs (such as Vicks VapoInhaler ) and some foods (such as poppy seeds) may cause a positive screening drug test. Verification of the test results with a different screening test or additional analytical tests should be performed to avoid adverse consequences for the patients. Several common prescriptions, over-the-counter medications, herbs, vitamins, and even some foods could trigger a false positive drug test. A Retrospective Analysis of Urine Drugs of Abuse Immunoassay True Positive Rates at a National Reference Laboratory. In addition to false-positive results, there are several notable limitations of immunoassay urine screens that can lead to false-negative results.6 Enzyme immunoassays used for amphetamines have low sensitivity to certain drugs commonly used in the rave scene, such as 3,4-methylenedioxyamphetamine (MDA) and 3,4-methylenedioxyamphetamine (MDMA), and they are unable to detect phenethylamine-based bath salts. 2021 Oct 27;13(10):e19082. A comprehensive literature review was conducted to identify false-positive UDSs associated with all clinic formulary medications, as well as common nonprescription medications. With CBD available in everything from drink powders, to weight loss formulations, to tinctures of all types, false positive urine screenings for THC will become more and more common, warns Dr. McFadden. Careers. Avoid smoking, alcoholic beverages, and unnecessary medications. She took the medicine twice a day (at 8 am and 8 pm), and the last dose was administered 9 hours before ED access. Bupropion (generic Wellbutrin). RELATED: Benadryl details | Doxylamine details. Ranitidine has been known to cause false positives for amphetamine on drug . False Positive Tramadol Urine Testing in Patients Taking Fexofenadine: A Tale of Two Consecutive Cases. 4,004. thank you. Dimetapp (Brompheniramine) Avoid everything that could cause a problem and result in another false positive for amphetamines. Illicit drug use. Tonic water contains quinine, and when consumed in large amounts could lead to false positive results for opiates. Small doses have central stimulant effects without significant peripheral actions. Common prescriptions, over the counter medications, herbs, vitamins or even foods can cause you a false positive drug test. Hair drug test: Positive doesn't always mean positive. This material is provided for educational purposes only and is not intended for medical advice, diagnosis or treatment. An official website of the United States government. They can distinguish between the l- and d-isomers of methamphetamine (only the d-isomer is psychoactive and illegal). A poppy seed can lead to a false-positive test result because it contains naturally occurring compounds also present in morphine and codeine. The potential for psychotropic medications to cause false-positive results for methadone was also evaluated. Additionally, you can ask to take a more accurate and conclusive test that can detect drug compounds in a specific manner such as gas chromatography-mass spectrometry (GC-MS) and high-performance liquid chromatography (HPLC). eCollection 2021. A recent study by Esposito et al published in the Journal of Analytical Toxicology showed that d-methamphetamine percentages often were a few percentage points above or below the expected value based on the standard solutions they were testing. This was due to impurities in some of the derivatizing agents used. This information is intended as an educational piece and should not be used as the sole source for clinical decision making. Drugs that are typically screened for include amphetamines/methamphetamines, benzodiazepines, barbiturates, marijuana, cocaine, PCP, methadone, and opioids (narcotics). Besides prescription sources, methamphetamine (ie, crystal meth) can also be produced in small, clandestine laboratories using ephedrine or pseudoephedrine as a key ingredient. Potential Source of False-Positive. Benzodiazepines also are regulary missed on enzyme immunoassay screens. Know if the meds you are taking might cause a false positive and notify the administrator of the test. Once methamphetamine is confirmed positive by MS, a third test may be performed to ascertain the ratio between the 2 isomers of methamphetamine. warnings are available, but usually only if you look for them, s. It is usually in the fine print and most people, in my experience, dont read the material given to them by the pharmacist. that you have taken it., Riboflavin, also known as B2, is found in hemp seed oil and may return a. is the non-psychoactive portion of the marijuana plant that has become a very popular remedy for everything from pain control, to promoting sleep, to helping relieve anxiety. Labetalol can also cause a false positive for amphetamine or methamphetamine because a labetalol metabolite is structurally similar to amphetamine. False-positive results Accessibility Most drug tests are simple, urine based immunoassay tests. Although this is not a high percentage, the consequences for failing a drug test could jeopardize your career, education, or job prospects. If it is prescribed, make sure you have the label from the pharmacy, which will show that the medication was prescribed to you. It is used for its powerful euphoric effects, which are similar to those of cocaine. Synthetic and semisynthetic opioids historically have not been included as part of federal workplace drug testing; however, in 2017 the U.S. DHHS released cutoffs for hydrocodone/hydromorphone and oxycodone/oxymorphone for additional testing.5. Street names for this druginclude chalk, crank, ice, crystal, Tina, meth, and speed. READ What Does M AMP Stand For On A Drug Test? The weight loss drug phentermine, may produce a false positive drug test. What Medications Can Cause A False Positive For Methamphetamemes Online Shop Are Blood Pressure Meds Fast Acting Rubbing Neck To Lower Blood Pressure Horse Chestnut And Blood Pressure Meds What Helps High Blood Pressure Go Down What Medications Can Cause A False Positive For Methamphetamemes.. And counting the time, it has been blood pressure meds and chronic cough nearly a day since what . (2019). doi: 10.1542/peds.2014-3333. 12. Sertraline (Zoloft) Sertraline is used to treat depression, panic attacks, obsessive compulsive disorder, post-traumatic stress disorder, social anxiety disorder (social phobia), and a severe form of . A number of routinely prescribed medications have been associated with triggering false-positive UDS results, and the most commonly used tests to screen urine for drugs of abuse are immunoassays, even though false- positive results for drugsof abuse have been reported with a number of these rapid-screening products. Yes: how long depend on the dose, and how long you have been taking it. Can Certain Foods, Drinks, And Meds Cause A . on What Can Cause A False Positive For Methamphetamines? Metformin is a drug commonly used to reduce the blood sugar of diabetic patients. The potential for false-positive UDS results was identified for the following medication classes on the clinic formulary: antihistamines, antidepressants, antibiotics, analgesics, antipsychotics . This article is not medical advice. Pract Pain Manag. Deerfield, IL: Ovation Pharmaceuticals, Inc.; 2005. Prilosec (omeprazole), Nexium (esomeprazole), and Prevacid (lansoprazole) are used to treat gastroesophageal reflux disease (GERD) or peptic ulcer disease (PUD) and can cause a false positive for THC. Case Reports of Aripiprazole Causing False-Positive Urine Amphetamine Drug Screens in Children. In 1998, the federal government raised the threshold on opiates from 0.3 micrograms to 2 micrograms per milliliter, but some drug testing facilities still go by the old standard. A possible false-positive test result for methamphetamine occurred during the laboratory testing of a parolee's urine. When a patients urine drug screen tests positive for methamphetamine by mass spectrometry, the result has serious implications for the patient and the provider. He graduated from the University At Buffalo with a Doctor of Pharmacy degree in 2010. Prescription drugs which cause false positive amphetamine tests include: Ritalin. Key points. Furthermore, if they can prove they are taking a medicine that can produce a false positive (by producing a legitimate prescription), the administrator may schedule another test 30 to 60 days later. Find out if theyre a perfect pair. Murray EP, Mansy L, Lackey JT, Link RC, Bonanni S, Sorensen AA. Taking metformin may result in a positive test for amphetamine or methamphetamine. , and are well known to cause a false positive for amphetamines and methamphetamines. https://www.uspharmacist.com/article/urine-drug-screening-minimizing-false-positives-and-false-negatives-to-optimize-patient-care#:~:text=The%20FGAs%20chlorpromazine%2C%20prochlorperazine%2C%20haloperidol,cause%20false%2Dpositive%20LSD%20results.&text=Thioridazine%20may%20additionally%20cause%20false,in%20structure)%20and%20methadone%20results. In addition a number of other medications and their metabolites can also cause false positive result for Methamphetamines they include; Metformin: Metformin (Glucophage) is the most commonly prescribed oral medication for diabetes. As we consider the 4th wave of the pandemic, it can be expected that drug users will need to test stimulants to see if they contain fentanyl. J Med Toxicol. About 5% Of All People Fail Their Test, Are Not Guilty And Must Then Prove Their Innocence. sharing sensitive information, make sure youre on a federal Analytes. Researchers are studying how the body handles chemicals that may test . Illicit methamphetamine availability and use poses a serious health risk in the United States today. Let outsiders enter, so our understanding of the strength of what medications can cause a false positive for methamphetamemes their students is very superficial. So, if you are like most people who dont take the time to study the fine print, here is a list of prescriptions and over-the-counter medications that could cause a false positive drug test. Schwebach a, Ball J. Urine Drug Screening: Minimizing False-Positives and False-Negatives to Optimize Patient Care. University of Illinois at Chicago College of Pharmacy. Methamphetamine Intoxication and Perioperative Complications Following Orthopaedic Surgical Procedures. These meds include pseudoephedrine, labetalol, bupropion, trazodone, and chlorpromazine. People taking the HIV medication Sustiva (efavirenz) may obtain false positive drug test results. Immunoassay testing for methamphetamine uses antibodies to look for certain drug metabolites (these are the compounds a drug breaks down into), and is the most common test used for initial screening. What exactly is Captagon and why was it banned? Results from such tests should be confirmed using additional analytical methods, including gas chromatography-mass spectrometry. These tests do not use antibodies and can accurately determine the exact molecule being looked for. Gas chromatography/mass spectrometry (GC-MS) is the gold standard for confirmatory testing. Used as an antidepressant, for weight loss, and smoking . In very rare cases, you can have a false-positive result. D-methamphetamine increases alertness, concentration, energy, and in high doses, can induce euphoria, enhance self-esteem, and increase libido. These traits make d-methamphetamine . January 23, 2017. Surgery 45 years experience. CBD is the non-psychoactive portion of the marijuana plant that has become a very popular remedy for everything from pain control, to promoting sleep, to helping relieve anxiety. Medications that have been reported to cause false-positive results for methamphetamine or amphetamine include: The easiest way to lookup drug information, identify pills, check interactions and set up your own personal medication records. The table below is just a sampling: Drug-Testing Target. Medically reviewed by Carmen Fookes, BPharm. Mexiletine and False Positive Urine Drug Screen for Amphetamine: A Case Review. Cureus. . False-positive interferences of common urine drug screen immunoassays: a review. InOut Labs is a nationwide provider of employee drug testing services, and your best choice for affordable, direct-to-consumer health tests. Some research has indicated that bupropion reduces the craving for methamphetamine, such as research by Thomas F. Newton and colleagues for Neuropsychopharmacology in 2006 2. The authors conclude that both promethazine and chlorpromazine can cause false-positive amphetamines UDS and recommend confirmation of any presumptive positive results with a secondary method . A saliva test can identify meth within 10 minutes after use, and it will produce positive results up to four days later If there has been an overdose, flumazenil can be used as a Table 1 Approximate detection times for a urine drug screen and substances causing false-positives Drug Detection Window Substance Causing False-Positives Alcohol 2 .