You can fail a urine drug test for several specific reasons. The test detects metabolites from illegal drugs. These metabolites are chemical footprints in your body. Even a small amount can cause a positive result. Using marijuana will make you fail. Using cocaine or methamphetamine will also cause a failure. The test is very sensitive and accurate. There is no safe level for these substances.
Illegal Drug Use
Recent drug use is the primary cause. Marijuana (THC) is a very common reason to fail a urine drug test. Cocaine, heroin, and LSD are also detected. Amphetamines like meth are clear violations. The military tests for a wide panel of substances. All these drugs are completely prohibited. Abstinence is the only way to guarantee a passing result.
Prescription Medication Issues
You can fail a urine drug test from prescription meds. This happens if the prescription is not yours. Using someone else’s Adderall is a violation. Taking another person’s painkillers will cause a failure. You must have a valid, current prescription from a doctor. You must also declare all medications before the test. Failure to report a legal script can still cause problems.
Contaminated Products
Sometimes a product causes you to fail the drug test. Some hemp seeds and CBD oils contain THC. Certain dietary supplements may include banned substances. Poppy seeds can trigger a positive result for opioids. The military does not accept this as an excuse. You are responsible for everything you ingest. Always check product labels and ingredients carefully.
The Bottom Line
The reason does not change the outcome. To fail a urine drug test is a definitive event. It leads to immediate disqualification from military service. There is no acceptable excuse for a positive result. The responsibility rests entirely with you. The only way to pass is complete and verifiable abstinence from all prohibited substances.