Since everyone has already answered the question, I thought I'd tell a semi amusing story about this.
I was on the last plane of the day into Cozumel, and for some reason my dive bag took forever to come through the carousel. Everyone else had gone through by the time mine came through. My wife and I headed for customs, where the inspectors had been waiting for us for some time. They were clearly ready to go home for a cold one.
When you go through customs, you push a button, and you get a red light or a green light. Green light means you don't get searched; red light means you do. Until that day, I had never seen anyone get a red light. I wondered if it was all a bluff.
Of course, we got the red light.
I thought the customs inspectors were going to cry.
You had to be there, but it was pretty funny at the time.
Hey, have a great time!