I have no real experience with this IRL (so probably means I'm in the target audience) but I understood the graphic to just be a starting point.
Couldn't it just be resolved with a simple follow-up conversation? e.g.
"Hey you're not a cop, are you?"
"No way man"
"Ok, lift up your shirt for a sec."
If he won't, he's probably wearing a vest and/or wire.
Or alternative scenario: "Hey you're welcome to join, but you gotta ditch the handcuffs."
"What, you mean this tin of sour candy?"
Ok, what's a better way then? I flat out told you I don't have experience with this.