ABC News takes a look at Bob Larson and exorcism

In a hotel conference room in Bakersfield, Calif., Bob Larson, who is not a Catholic priest, says he, too, can cast out demons. He and his staff exorcize thousands of people a year, traveling around the world to perform the rituals.

Larson said people were possessed by demons, not the devil himself.

"The devil can't be everywhere," Larson said. "God can be everywhere so the devil has to duplicate the omnipresence of God by sending demons out to do his work."

According to Larson and the hundreds of other Christian deliverance ministers, these evil spirits can cause people to commit horrible acts from small sins to murder.

"More people are possessed today than ever have been in history," Larson said. "We have more permission today to do bad things than ever before. That doesn't explain the mother in Texas who chops off the arms of her baby."

Larson concedes that throughout history people have suffered from mental illness, but he also says that people have always been possessed by demons.

Janelle Mallard was exorcized by Larson. During the ceremony she spoke in a strange voice and flailed around almost uncontrollably.

"I feel refreshed, like something's lifted off my spirit," Mallard said after the exorcism.

"I can't convince anyone this is real except to say look at the newspaper headlines day by day and see if you really think the immensity of the violence and crime are truly the result of just human nature gone mad," Larson said.