According to a report by the Georgia Bureau of Investigation, in nearly 20 percent of the fatal shootings involving police officers since 2012 the subject had methamphetamine in their system.
Others who were killed in the time period studied had cocaine or marijuana in their system, according to the GBI.
Over the period studied, 188 people were killed by law enforcement and toxicology tests were performed in 173 of those cases. The tests found 124 were positive for a variety of drugs, according to WSB-TV.
"I believe that many of the bizarre and very violent crimes that occur, the perpetrator is a meth user, and that’s from my experience," GBI Director Vernon Keenan told The Atlanta Journal-Constitution. "It is a very destructive drug, and it causes violent behavior."