- An enzyme is added to your urine sample that binds with the metabolites of any drugs that may be present.
- The reagent does not bind with the drug, but with what is eliminated by your system after metabolism.
- After a second reagent is added, a machine measures the activity in your sample.
This process is how drugs are measured in your system.
Basic Urine Tests Are Cheap
Question authority when it comes to drug testing. If you fail a urine test there are hundreds of medications that could have caused a false positive. The tests are far from 100% accurate, that should give you leeway to dispute your results.