Placing them in clear bags will help to speed up the hand inspection process, but the problem arises when airport staff are bound by procedure to send everything thru the x-ray machine. No exceptions. More likely to happen when staff are new, poorly trained or mis-informed even if there are guidelines clearly stating that photographers have the right to hand-inspection in U.S. airports. There may be certain clauses involved, but I'd rather not press my luck.

If you separate your film from your gear and make it easier for airport staff to inspect, it demonstrates your willingless to co-operate and they may be more likely to just take a glance and wave you thru.

Certain bags have detachable film pouches specially designed for easy visual inspection, either using net pouches or the clear reinforced plastic pouches found in lowepros and other brands.