I used to travel from the US to Chile fairly often, and the Chileans put all entering baggage (after arrival and collecting your checked bag) through an X-ray for agricultural inspection. There are plenty of signs before warning you to declare fruit/vegetable products to avoid fines. If you're a foreigner they're more likely to take it away and scold you than fine you, I think, but they do mean business. I don't remember ever taking film out of my bag for this X-ray, and I never got any film fogging (it was probably like the old generation of carry-on scanners), but I'm sure they would have allowed hand inspection, or you could just put the film in your coat pocket. They only cared about fruit/vegetable matter. I thought they mostly were looking for fresh fruit, but friends of mine have gotten scolded for dried products and even IIRC had sealed energy-bars confiscated. Agriculture is a big part of their economy and they don't want any imported bugs.
I'm pretty sure I've seen an agricultural inspection X-ray at an airport in Hawaii for similar fruit/vegetable reasons. I only remember this happening on exit, oddly enough - probably people trying to smuggle pineapples back to the mainland or something equally stupid.