Make sure your car is CLEAN. It would suck if you rolled through a checkpoint and a spent shell casing slid out from under the seat or something. That would cause all manner of unnecessary headache.
The only vehicle that I am certain is DC clean ismy rig, since I can't carry on it, anyway. And, since I have so much personal stuff on that truck, I am not 100% sure about that.
I have banned my vehicles from ever going to DC.
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