Screening distinguishes between negative and potentially positive specimens. Confirmation testing is performed only on specimens that are positive on the screening test. Large doses and long term usage can result in higher tolerance levels and dependency. Cocaine Cocaine is made from coca leaves. Its effects include alertness, wakefulness, increased energy and an overall feeling of euphoria.
Cocaine can be a very addictive drug.
Methamphetamine Methamphetamine is a stimulant drug. It is used in pill form, or in powdered form by snorting or injecting. Crystallized methamphetamine is a smokable and more powerful form of the drug. Methamphetamine use can cause irreversible damage to the brain, producing strokes and convulsions, which can lead to death. Opiates Opiates are any of the addictive narcotic drugs.