It was in with the checked luggage, which is kinda weird. I would have gone through security at least 3 times that I know of before getting developed, although the film I bought since I've been here it went through and came out ok, just my 2 rolls from Australia.
Okay, that's a little different. They warn you here in the States to not put your film into checked luggage without one of those lead lined bags. Apparently, the x-ray machines they use for those are a hell of lot more powerful and expose your film to much more radiation than the ones they use for the stuff you carry with you.
Supposedly, unless you've got film that's 1000 speed or higher, the ones they use for carry-ons aren't going to do anything to it.