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Testing for Marijuana Use – Marijuana Drug Testing Methods: Hair, Saliva & Urine Testing Testing for marijuana use is becoming more and more popular on the job market today. Not only for health reasons, but also for safety issues. For those of you who are not familiar with marijuana, it is a greenish-gray mixture of the dried, shredded leaves, stems, seeds, and flowers of the hemp plant, Cannabis sativa. It is typically smoked in hand-rolled cigarettes (joints), cigars (blunts), pipes, or water pipes (bongs). The active ingredient in marijuana is delta-9-tetrahydrocannabinol (THC), which is responsible for the potency and effects of marijuana intoxication. Over the past two decades, THC levels of marijuana in the United States have increased. Hair Drug Testing – What Parents need to know about Hair Drug Testing? Hair drug testing is a rather simple procedure. To start, you remove a strand of hair from your head or the participant's head. This strand is then sent away to a lab for analysis. There are various types of drug tests available on the market. The two most common types of drug tests include urine tests and blood tests. These are also very effective. The downside is that they can only detect drug use that took place within the last three days. Thus, it is possible for a drug user to quit using illegal drugs for a short period in order to pass a drug test.