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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.

On-site drug tests typically give instant results. The on-site drug tests are generally less intrusive or non-intrusive and can be administered confidentially without any external interference. The best examples of on-site drug test are urine drug test and oral drug test. The on-site or instant drug tests are used by people at home, at work places or educational institutions.

There are five primary types of drug tests: urine, blood, hair, saliva, and sweat. Blood test is the oldest kind of drug test but it is cumbersome, expensive and intrusive.

Urine drug test is the most common drug test it is inexpensive, simple and easy to administer. Urine drug test are preferred as they are reliable, can be tested for many types of drugs both by individuals and by schools and employers. Urine drug test also called urinalysis

Oral drug test is the newest form of drug testing, which is a relatively new method but is being increasingly used because it is the least intrusive test procedure. Oral Drug Test is also preferred by employers and schools because the samples are difficult to adulterate and can be collected easily in virtually any environment. Oral drug test kits are available in various forms for private drug testing at home, drug testing in schools as well as drug testing at workplaces.

Hair drug testing is pretty expensive and can detect drugs for over a long period of time. When used at the right time they are very sensitive and show more accurate results. Blood test is the most expensive and intrusive test but is the most accurate test.