DO NOT put any film into checked baggage. The new film scanners can fog ISO200 film in a single pass.(posted 8687 days ago)Scanners for hand carried baggage are normally safe to ISO1600, but are some are only safe to ISO 400.
In the US and Canada you have the right to have your film hand inspected (not run through the scanner). In other countries you may or may not get a hand inspection, and you do not have a right to this service.
When traveling I use a Sima Super Shield film bag. This sometimes triggers a hand inspection, but I have not had any fogged film. But I have also had film in a camera go through several scanner passes and not have any fog either (ISO 400).