It is not uncommon for chronic methamphetamine users to experience psychotic behavior including intense paranoia, hallucinations, and out-of-control rage that can result in violent episodes.
The kidneys and lungs remove about 10% of the alcohol in the urine and breath, making the breathalyzer test a valid tool to measure a person's blood alcohol level.
One study found that individuals who had used Ecstasy just a few times had levels of depression that were up to four times greater than those who had never taken the drug.
Opioids are the most common category of prescription drugs abused in the U.S., comprising about 75 percent of the prescription drug abuse problem.