Methamphetamine, commonly known as Crystal Meth, is an abusive drug used for recreation. It acts as a stimulant to the Central Nervous System, causing light headedness and hallucinations. Methamphetamine can cause quick addiction, and leads to loss of teeth, hyperactivity and periodic fainting. Drug tests are used to monitor a person's use of abusive drugs. The test is usually done by assessing drugs in urine sample, sweat sample, saliva and even hair. The test is usually ordered by most employers before hiring an individual. It is also routinely performed for individuals in sports. Apart from this, the test may be ordered for an individual displaying addiction- like symptoms.