Truth key
"Truth key" is to be used when a person(s) is believed to be lying. If the person lies on a truth key - the penalty is harsh as they are sure to get AIDS. No one want's AIDS, so no one lies.
"Mate, I slept with that blonde behind the bar" - Person A
"Truth key" - Person B
"No, I didn't" - Person A
"Truth key" - Person B
"No, I didn't" - Person A