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There are basically four types of drug tests that they perform.
This procedure usually involves you going into the bathroom and filling up a cup with your urine. They either use a test card right then for immediate results or send it away to a lab to get tested through a sophisticated gas analyzer.
Hair testing is quite accurate and can go back 6 months, showing all of the toxins you used in a sort of timeline. Many people try to get around this by just shaving their head. Know that they will go for your underarm, pubic, leg or arm hair if you do not have the required 1/2 inch on your head.
Blood testing is usually performed for serious employment positions or when you are applying for insurance policies. This is expensive and not very common.
This is not common and can only detect toxins used 3-4 days prior. Insurance companies and law enforcement agencies use this method most often.