In organizations rather than sending potential employees (or employees chosen for random testing) to a clinical laboratory, some employers have begun performing their own on-site drug testing. Benefits of on-site drug testing include cost, convenience and accuracy.

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There are two major types of drug testing methods – Laboratory drug tests and on-site drug tests. Laboratory drug testing is a complex process wherein the sample of a person to be tested is taken and sent to the lab for being tested. It may take several days before the results are known.

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