Cops Deny Tasing 7th Heaven Actor

As TMZ first reported, Keegan was handcuffed and detained by police officers after he was "uncooperative" when cops asked Keegan to turn down his music.

Law enforcement sources tell TMZ they did not tase Keegan at any point, pointing out that if they had ... they would be required to take him to the hospital. But several witnesses to the encounter tell TMZ they say Keegan get tased.

Here's where the video comes in to play ... at around the :45 and :54 marks, you can hear what sounds like a taser going off -- it's hard to make out for certain over Andrew's screams.

When contacted for comment, Keegan gave us a very diplomatic response, which said in part, "I always cooperate with the authorities and am confused by the show of force."