Yes they have. I can vote there.
I will bitch at my representatives about this.
I can also drive to Idaho and get what ever ammo I want.

In NC, we had restrictions on fireworks, yet right across the SC border were fireworks stands and stores -- go figure.
Around major holidays, the NC State Highway Patrol would set up checkpoints and have cars where they can watch the stores.
If they saw a car or truck drive into SC, stop at one of the fireworks stands, then turn around and come back into NC, they'd stop the driver and give them a ticket for their crime and confiscate the illegal contraband.
I would not be surprised if traffic cams and checkpoints were set up between Washington and neighboring states to watch for "shoppers."
Often, just the presence of the checkpoints -- normally labeled DUI checkpoints to keep people celebrating the holiday safe -- would deter most from trying to sneak fireworks into the state.
I might be wrong, but it wouldn't shock me if they tried, at least in the first couple of years until they realize it's futile.