Samples substituted with urine from another source (e.g., a friend, spouse, commercially available urine, even an animal)
The specimen will not usually pass temperature tests (checked by the collector); those that do pass within the accepted range usually will not pass the specific gravity tests (checked by the lab).
Lab tests today can often indicate that the sample is not from the donor. In at least one case a man substituted his sample with that of his wife. When the specimen failed the temperature test, lab testing indicated "he" was pregnant.
Adulterated samples will throw pH levels off or exhibit substances not normally found in urine. In cases where a definite positive or negative result cannot be determined, donors may be required to resubmit a sample under "observed" supervision. New lab testing methods now easily determine the presence of nitrites, such as the masking agent found in Klear®. Once nitrites are detected, further testing removes the masking effect to discover which drugs are present. Laboratories are constantly updating testing methods as new adulterant products enter the market.
For Inquiring minds
Drug Approximate Detection Time in Urine:
Alcohol 1-2 days
Amphetamines (crystal, Ice, crank, methamphetamines) 5-7 days
Barbituates Short-Acting (ie. secobarbital) 1-2 days
Barbituates Long-Acting (ie. phenobarbital) 2-3 weeks
Benzodiazepines (Librium®,Valium®,Serax,Xanax®) 2-30 days
Cannabinoids (THC,Marijuana) 20-90 days
Clenbuterol 2-4 days
Cocaine (Crack) 3-5 days
Codeine 2-5 days
Euphorics (MDMA, Ecstasy) 3-7 days
LSD 1-4 days
Methadone 3-5 days
Methaqualone (Quaalude) l-14 days
Opiates (heroin, Vicode, morphine, codeine) 2-7 days
Phencyclidine (PCP, Angel Dust) 1-30 days
Phenobarbital 10-20 days
Propoxyphene (Darvon) 1-3 days
Psilocybin (mushrooms) 3-5
Steroids (anabolic) oral 14 days
The amount of time any drug can be detected in one's system can vary from person to person and test to test. It certainly can also depend on the amount of the drug taken and when it was taken relative to the time of the test. Keeping in mind that there is no 100% hard and fast rule for how long a drug will be in one's system, listed above are some general guidelines on the drug test detection time for various drugs.