What ingredients can cause a false positive drug test?

Drugs that can cause false positives

• 1) Dextromethorphan. Dextromethorphan is an active ingredient in Robitussin, Delsym, and other over-the-counter cough suppressants.
• 2) Diltiazem.
• 3) Diphenhydramine.
• 4) Metformin.
• 6) Labetalol.
• 9) Tramadol.
• 10) Phentermine.
• 11) NSAIDs.

Can a diluted drug test still be positive?

Sometimes dilution is intentional, but it can happen accidentally as well. If the drug levels do not reach a certain cut-off point established by the laboratory, the specimen will not be marked positive for the drug even if it is detected.

Can you cheat a drug test by drinking water?

This can be abused by intentionally over-consuming large quantities of water before a drug test. This will lower drug ratios in the urine. Unfortunately for cheaters, this does not guarantee a negative result, and the laboratory will immediately detect the diluted sample.

Can you cheat a drug test at a urine collection site?

While lab technology can now identify adulterated samples and other attempts at cheating drug tests, safeguards also exist at the urine specimen collection site, whether it’s at a clinic or at the job-site. For example, donors must present a photo ID.

Can you cheat a urine drug test for marijuana?

A full vial of the easy-to-buy product can successfully mask THC — marijuana ‘s active ingredient — if it’s added to a urine sample. This cheating method doesn’t work for heavy marijuana users.

Why do they make you drink water before a drug test?

If you’ve ever heard of people drinking tons of water ( or cranberry juice even) prior to a drug test, this is one reason they do this. (It’ll effectively drop the drug ratios that are seen in the urine sample.)