Robert M. Gary wrote:
Emily wrote:
Personally, I always carry on, even to Mexico.

Unless its required, can't see why you would want to. You might lose
it. I always leave mine at home.

-robert

Two years ago, a friend and I took a quick trip to TJ. INS or whoever
they're called now, would not let my friend back into the USA with just
his driver's license. I had to call his parents from this side to drive
his passport down from San Diego. I was NOT happy about hanging around
the San Ysidro crossing by myself, believe me.