Tyreek Hill was first pulled over Sunday morning because he was driving recklessly ... and he was thrown in handcuffs moments later because he was being uncooperative -- at least, that's according to a huge police union in Florida.
The president for the South Florida Police Benevolent Association -- which represents over 6,000 law enforcement officers in the Sunshine State -- said in a statement to TMZ Sports Hill put "himself and others in great risk of danger" while on his way to Hard Rock Stadium.