Officials found Tate, 17, and a friend walking near Tate's Pembroke Pines home last Friday, sweating and panting as though they had been running, the Broward Sheriff's Office said.
Tate, who gave a false name, and his 18-year-old friend told sheriff's officials they had been "chasing girls," though no girls were seen in the area, according to a sheriff's office report.
Tate agreed to a search, and deputies found a folding knife with a four-inch blade in his front pocket and identification cards with his real name.
A probation officer determined Tuesday that Tate was in violation of the terms of his probation and he was arrested at his home. He was being held without bail at the Broward County Jail.
Calls to Tate's appellate attorney Richard Rosenbaum were not returned late Tuesday.
Tate was 12 when he killed 6-year-old Tiffany Eunick more than five years ago. He served three years of a mandatory life sentence for first-degree murder before the 4th District Court of Appeal overturned his conviction, clearing the way for a plea deal to second-degree murder.
Before the deal won Tate his freedom, he had claimed he accidentally killed the girl while imitating professional wrestling moves he had seen on television. His life sentence stirred national debate over Florida's treatment of juvenile criminals.