'Home Improvement' Star Jonathan Taylor Thomas Detained For Obstructing a Sheriff's Deputy

Jonathan Taylor Thomas was detained for obstructing or resisting an officer ... TMZ has learned.

Law enforcement sources tell TMZ ... the former child star was the passenger in a vehicle that got pulled over on Monday in Westlake Village, California.

The actor exited the vehicle, and after deputies told him to remain inside, he refused and was uncooperative, according to our law enforcement sources. We're told he was drunk in public and resisted.

JTT was then detained at the Malibu/Lost Hills Sheriff's Station's jail on Monday ... jail records show. He was released a short time later.