Adulteration is the tampering of a urine specimen with the intention of altering drug test results. The use of adulterants can cause false negative results in drug tests by either interfering with the screening test and/or destroying the drug metabolites present in urine. Urine adulteration can be performed in many ways:
There are no true ways to pass a drug test apart from practicing sobriety. A modern-day urine drug screen provides drug test adulteration detection by measuring urinary properties:
A normal urine pH level hovers around 6.0, which means urine samples should be slightly more acidic than water. Water is neutral at pH 7.0. A diluted urine sample can be identified when the urine pH level is measured close to neutral. Adulterating urine with acidic compounds, e.g. vinegar and lemon juice, or basic compounds, e.g. bleach and creatine will bring normal urine pH levels outside of the normal range.
Ensure the temperature strip is black before administering a urine drug test. Once urine is deposited into the drug test cup, the black temperature strip will become a bluish green color. Normal urine temperature falls between 97 and 100 degrees. As a reference, 98.6 degrees is average body temperature. If urine specimen temperature is indicated outside of the normal urine temperature range, the drug test result should be Invalid. Many drug testing adulteration methods, e.g. using synthetic urine or swapping clean urine may not affect the temperature of urine specimens. Therefore, temperature should not be the only factor used to determine possible adulteration.
When included in a drug test, oxidants/pyridinium chlorochromate (PCC) can detect the presence of adulterants, specifically bleach and hydrogen peroxide. Pyridinium chlorochromate (also sold as “UrineLuck”) is a commonly used adulterant; however, normal urine specimens should not contain any traces of PCC.
Glutaraldehyde tests for the presence of an aldehyde. Adulterants containing glutaraldehyde may cause false negative drug test results by disrupting the enzyme used in some immunoassay screens. Unadulterated urine specimens should not contain any traces of glutaraldehyde.
Specific gravity tests for dilution for a urine specimen. The average specific gravity of urine specimens ranges from 1.003 to 1.030g/cm³. Values outside this range suggest sample adulteration by dilution with water or other liquid compounds.
Nitrite tests for adulterants which work by oxidizing carboxy-tetrahydrocannabinol, the body’s primary metabolite of marijuana. Normal urine specimens should not contain nitrate, and the presence of nitrates immediately flag the possibility of adulteration.