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Drug testing looks for signs of one or more illegal or prescription drugs in a urine, blood, saliva, hair, or sweat sample. For example, it may look for marijuana, prescription pain medication, heroin, cocaine, or methamphetamines.
Yes, most drug rehab centers and drug detox centers drug test each client who enters the program. This testing aims to determine what drugs are in the client’s system to apply the proper rehabilitation and detox process.
Hair testing can go back as far as 90 days; however, it is the most flawed process, as drugs can show up in hair if even not consumed. Urine drug testing is the most reliable; both illegal and prescription drugs are detectable between three and seven days after consumption. The results are more trustworthy. Saliva testing is also reliable, but there is a small detection window within 24 hours.
There is a screening test, which only shows positive or negative for the presence of drugs; no quantities are provided. Confirmatory tests determine specifically how much of a drug is in the body and are typically performed after a screening.