My favorite legal loophole is Missouri:

You can be intoxicated in hour domicile and still defend yourself.

Cars are domiciles.

You can be legally packing while drunk in a car.

Bigger cities like KC and STL will take the gun, but they cannot charge you with a firearms offense without triggering a state constitutional lawsuit, so they just give it back to you after they've made a lot of noise in the press about how policing is taking firearms off the streets.