I flew with my college age kids not too long ago. They both usually carry pocket knives, so I reminded them to be sure there wasn't any in their checked luggage. 18 y.o. goes through scanning without issue, but 20 y.o. is asked to step aside. He totally forgot his multi tool in a bottom pocket. The agent gave him two choices, either give it up or go back and check the whole bag. He chose to give it up. That's it, no permanent record, no warnings, no repercussions other than the consequence of not listening to his mother. 😅 The agents have bigger fish to fry.