The problem is that at Mexico City airport they have no interest in hand inspecting film. I tried to ask them & the security woman just barked at me in Spanish to put my bag through the machine.
Originally Posted by copake_ham
As for flagging itself, I had a lead bag with dozens of rolls of film in my backpack that went through LAX twice, Mexico City twice & once each for Auckland & Sydney & passed through each time without notice.
I know there are people who think it's all drama about nothing & we should just put the film through the machines, but I have seen film with Xray damage, so it's not a myth. I found it pretty easy to pack everything in the lead bag, it's really just part of the whole packing process. A small price to pay to feel that my film will be OK.