He was a person of interest, duh.
No, he was a suspect. They stopped him in the belief he was involved. Here’s a fact for you. Person of interest has zero legal meaning.
If you think they may merely have information, they are a witness or a material witness.
If you have the slightest scintilla of an idea they are involved in the crime, they are a suspect... nothing more, nothing less.
Contact with a suspect can elevate them into the accused if charges are filed. Or it can clear up the suspicion they were under and they are released... as this man was.
But there is no category where the cop thinks they are involved and the term person of interest applies rather than “suspect”.
It was a term popularized by the FBI abuse of Richard Jewell and by women’s pop TV crime shows. You not understanding it is no big deal. But for Kash to use that term shows that he has no place being the FBI director.
It would be like the CEO of Google or Apple using the term “interwebs” or something.
Oh buy the way... “duh” lol.