BANGKOK (AP) — Thailand’s attorney general’s office has confirmed that it will not prosecute an American academic arrested in early April on a charge of royal defamation, his lawyer said Thursday. The offense is punishable by up to 15 years in prison. Paul Chambers, who had been employed as a political science lecturer at Naresuan University in the northern province of Phitsanulok, departed Thailand after the ruling, said his lawyer, Akarachai Chaimaneekarakate, who declined to reveal his destination.