Law enforcement has no right to just stop you on the street randomly. They have to have evidence of a crime or that you’re suspected of a crime. If, however, you offer up your credentials, shame on you.
“Am I being detained, or am I free to go?”
“Am I being detained, or am I free to go?”
...
Good advice, but the SCOTUS is ruling that the discovery of the warrant meant he was no longer free to go. Although, they apparently agree that there wasn’t enough cause for a temporary detention.