Drug testing refers to the process of analyzing biological specimens, such as urine, blood, saliva, or hair, to detect the presence of drugs or their metabolites in a person's system. These tests are conducted for various purposes, including pre-employment screening, ensuring safety in the workplace, monitoring individuals on probation or parole, and detecting drug abuse in medical or forensic settings.

There are different types of drug tests, each with its advantages and limitations:

1. Urine Drug Testing: This is the most common method and can detect recent drug use. It's relatively non-invasive and cost-effective.
2. Blood Drug Testing: Blood tests can detect the presence of drugs in the bloodstream and are often used in situations where recent drug use needs to be confirmed or for specific legal or medical purposes.
3. Saliva Drug Testing: Saliva tests are less invasive than blood tests and can detect recent drug use. They are often used for on-site testing or in situations where immediate results are needed.
4. Hair Follicle Drug Testing: This method can detect drug use over a longer period, typically up to 90 days, depending on the length of the hair sample taken.
5. Sweat or Patch Testing: These methods involve collecting sweat samples or using adhesive patches to detect drug use over an extended period, usually weeks to months.

The choice of drug test depends on factors such as the specific drugs being tested for, the detection window required, the invasiveness of the test, and the purpose of testing.

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