"He's been taking steroids as long as I've known him. He's addicted and it gives him violent mood swings. He's also on antidepressants and used to be a drug dealer, so God knows what he takes," she said.
But those who knew him well have trouble believing his murderous quest.
"He is not my son," Josephine Healy, Moat's mother, told The Sun. "I just don't recognize him as my son. My son was loving, non-violent.
"If I could speak to him now, I would say he would be better off dead."
Police arrested Karl Ness, 26, and Qhuram Awan, 23, on Tuesday in connection with Moat's disappearance. The two men were arrested when found wandering around the streets of Rothbury. Originally believed to be hostages, Ness and Awan are believed to have helped Moat hunt for police officers. The two men appeared before magistrates in Newcastle on Thursday and face charges for conspiracy to commit murder and possessing a firearm with intent.
Wilson told ABC News that two more people were arrested on Wednesday on suspicion of assisting an offender.
Moat's murderous rampage comes on the heels of that of Derrick Bird, who killed 11 and injured 12 people before killing himself in Cumbria on June 2.
The Northumbria Police is looking to the public for help in the investigation. They have offered a £10,000 reward for information that directly leads to Moat's capture.