In 2001, a co-worker invited me to his 4th of July party in New Hampshire. I had to visit a customer in Plaistow with him, so we stopped at a fireworks stand ahead of the customer visit. I paid for a bunch of stuff, threw it in the trunk of my car, then drove to the customer site to meet him.
Did the customer visit, handed off the fireworks to him, then drove home.
Shortly after crossing the Mass border, a Statie started to follow me, then pulled me over. He asked if I had contraband in the car. I said no, he asked that I step out of the car. Got patted down, he said there was photographic evidence of me purchasing fireworks, and those are illegal in Massachusetts. I said I handed them off to a NH based co-worker for his weekend party. The trooper then searched my car, found my Estes Model Rocket launch kit in my trunk and gave me the third degree about it.
Roughly 90 minutes later, I was on my way.