Digital BW, The Print

Sorry that this may be slightly OT, since it seems to refer to film, but
many of us still shoot film and then scan it, so:

It seems like it would be a good idea to print out the page from the TSA
site, complete with their letterhead, as a start.  They recommend NOT
carrying film in lead-lined bags, since they say that this will cause
hand-inspection.  Either they ramp up the machine so that they can see
through the bag, or they are very slack, since I've taken scores of flights
with film in those bags passing through the X-ray machines, and have almost
never been asked to open my bag.  Though I don't generally take anything
faster than 400 ISO film, and I've had some rolls in bags that have passed
through machines at least 8 times with no damage.  The bags are also useful
for insulating film from heat if you're going to a very warm climate.

The other issue, as they point out, is that if you are going to another
country, they are not at all likely to have a policy that allows you to
request hand-inspection of carry-on baggage.  I've been in a number of
situations where it was made very clear to me that I either put the bag
through the machine or I didn't get on the plane.