Urine drug testing is an essential component of monitoring patients who are receiving long-term opioid therapy, and it has been suggested for patients receiving long-term benzodiazepine or. Additional Details Poppy Seeds. Poppy seeds, often found on bagels, rolls, and pastries have long been used as a defense against positive opiate test results encountered on a urine drug screen. Tuberculosis and HIV: HIV InSite Knowledge Base Chapter January 2013: Annie Luetkemeyer, MD, University of California San Francisco Original chapter written by Lisa Goozé, MD, and Charles L. Daley, MD, University of California San Francisco How Long is Marijuana Detectable on a Urine Drug Test? A urine drug test can detect marijuana as soon as 2 to 5 hours after use. However, the bigger question is how long will it still be detected with a THC urine drug test. 0 12 Things That Can Make You Fail A Drug Test. Failing a drug test is not exclusive to people who usually use drugs only. There are various products which when consumed, will lead to a false positive in a drug test. False Positive Drug Test Facts. A False Positive Drug Test Should Worry Anyone Undergoing A Drug Test. A false positive drug test can happen with the urine, hair, saliva or blood test, but it is far more likely with the urine drug test. An estimated 20 million Americans smoke marijuana. Having a positive urine drug screen, therefore, may not be unusual—except if the patient swears they don't smoke pot. Learn why non-smokers may test positive for marijuana. Learn about Truvada (Emtricitabine and Tenofovir Disoproxil Fumarate) may treat, uses, dosage, side effects, drug interactions, warnings, patient labeling, reviews, and related medications. Before you put too much weight on a positive or negative urine drug screen, familiarize yourselves with its limitations: Timing of exposures, false positives and the multitude of drugs that can be missed. Propoxyphene is in a group of drugs called narcotic pain relievers. Propoxyphene is used to relieve mild to moderate pain. Propoxyphene may also be used for purposes other than those listed in this medication guide.