A number of years back, for a government project, I took some 1000' rolls of P3200 through as carry-on. I packed these inside a box that was lined with 1/4" thick lead plates with the result that there was a hand "inspection," although they did not ask to open the film cans that were clearly marked with Kodak factory labels. That was one heavy box to carry! Recently I took film in a lead bag through with the same result mentioned by others--a sniffer swab and examination of the 35mm casettes but no further problems. As most of us know film has a definite odor when one opens a can containing a long roll. Evidently the aromatic film compounds are not the correct ones to give a result on the swab tests.