PHOENIX -- Police have arrested four naked men in the past two weeks.
"We have had some bizarre incidents. They are driving vehicles, hijacking vehicles, wild things, and they have no clothes on," said Officer James Holmes of the Phoenix Police Department.
One of those naked men, John Brigham, made his first court appearance Tuesday. According to court documents, Brigham was under the influence of PCP when he caused two car wrecks June 29 in north Scottsdale and carjacked a Prius, all in the nude.
Also on June 29, Yavapai County officials arrested Calvin Forrey, who was nude when he allegedly stole a Jeep.
Forrey later died and toxicology reports are pending, but police said he was an admitted bath salts user.
On June 20, police fished a naked Chris Brown out of Tempe Town Lake and found drug paraphernalia in his possession. Brown was able to elude authorities for more than an hour, swimming nude in the lake.
On July 4, police said a naked man ran a rental truck into a home near 32nd and Cactus.
Police have not yet verified whether that man was under the influence of drugs, but according to an officer on the scene, "Generally speaking, every time you run into a naked man, there is some kind of illicit narcotic."
Lloyd Vacovsky, the Director of Assisted Recovery Centers of America, said there is a specific reason nude, outlandish behavior could be tied to synthetic, illegal drugs like PCP, bath salts, and meth.
"It increases body temperature. So especially in the summer, it impacts people even more, especially in Arizona," said Vacovsky.
Vacovsky said his treatment center has seen a 100 percent increase in treatment for bath salt use, and he has also seen a massive rise in bizarre behavior related to these types of synthetic drugs.
Police at this time are unwilling to say that all of these naked incidents were directly related to drug use, but add that it is a possibility.
"If these people are under the influence of narcotics, that might explain the lack of clothing," said Officer Holmes.