Common drug tests (e.g., for THC, opioids, stimulants) target metabolites processed by the liver and excreted in urine. Detection depends on:
1. Substance half-life: How long the drug remains in your system.
2. Frequency of use: Chronic use leads to longer detection windows.
3. Body factors: Metabolism, hydration, and body fat can affect how quickly drugs are excreted.
Many substances clear naturally over time. Stopping use and allowing your body to metabolize the substance is the safest way to ensure a clean test. THC, for example, can linger for months in chronic users due to its fat solubility. Most substances, however, cease to be recognizable in urine tests much faster.
Drinking water increases urine output and may dilute metabolite concentrations, but labs often test for creatinine levels to detect dilution.
Products marketed as detox drinks or pills claim to "cleanse" urine but are often unreliable and detectable by advanced lab tests.
Adding chemicals (e.g., bleach) to urine is easily identified in modern tests and can invalidate results.
Some attempt to use synthetic or substituted urine. Labs counter this by checking for temperature, pH, and specific gravity.
As
Osmosis Vanderwaal wrote - trying to give someone else's clean urine is the best option if there is no time. If there is time, it is worth stopping using and give the test yourself.