Everyday carry handcuff key

Two questions:

  • What happens to you when a cop discovers one of these keys in your possession while they’re searching you, either prior to or after cuffing you?
  • What happens to you if, the cop having not discovered it in a search, you actually use the thing to unlock the cuffs you’re wearing?

I’m afraid I’m pretty cynical about how this little device would be viewed by cops.