[Modernman]

If I invite you to come to my house, it does not give me the right to go through your car when you get here. Or your wifes purse. Or your wallet. Or do body cavity searches on you.

You can make such searches a condition of allowing me onto your property. If I don't like those conditions, I'm free to give you the finger and walk away. If I'm already on your property, you can demand to search my car. If I refuse, you can require me to remove my car and my person from your property.

[Dead Corpse]

If I'm already on your property, you can demand to search my car.

Isn't that a LOT like changing the rules of the game after the final buzzer goes off?