I knew a pilot who got fined for an old orange in his flight bag that he obviously forgot about. I've also talked to a guy that said they would just let him throw them away and that was the end of it. So I guess it depends on which person you get and what kind of day they are having. I am paranoid any time I am being subjected to inspection by CBP. I even double and triple check my car before I drive in to Canada up here in Detroit. If they feel like ruining your day they have the power to do it. I would rather just not give them the opportunity.