What can cause a false positive on a urinalysis test?

On Behalf of | Feb 27, 2020 | Criminal Law | 0 comments

If you are taking urinalysis exams, it may be because you are on probation for criminal charges, or it may be a requirement of your employment in Arizona. In either case, a positive test result can spell disaster. 

If you know for a fact that you have not taken any illegal substances, a positive UA result can be shocking. If you try to explain yourself, it is unlikely that the party requiring your testing will give you the benefit of the doubt. That is why you should be aware of what foods you eat and what prescriptions you are taking, to avoid a false positive. 

CBD oil 

Cannabidiol is a non-psychoactive compound contained within the cannabis plant. It has caught on in popularity in recent years thanks to its purported health benefits. If you are being screened for THC, however, you may want to avoid taking CBD or eating any products that contain it, as according to Web MD, it can potentially trigger a false positive for marijuana. 


Not all antibiotics will affect UA results, but if you have taken the antibiotic Rifampin, it may show up as an opiate in a drug screening within 18 hours of consumption. That is why you should always let your probation officer or employer know about any prescriptions you are on when you are taking UAs. 


If you are being tested for alcohol in your blood, it is not just mouthwash you should avoid. Today’s EtG tests can pinpoint even trace amounts of alcohol several days after consumption. That means you should avoid alcohol-based sanitizers and anything else preserved in alcohol when taking regular UAs. 

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