earl southers, former nominee to head the tsa and isaac yeffet, the former head of security for israel, state-run airline, el-al. >> i never said that we'd say that passengers because they are in a wheelchair we should not search them. but when i see a woman, 95 years old, sitting on wheelchair, because alarm went off, i have to be so stupid to search her from a to z, including forcing her to pull out her diaper? this is not security. this is a joke! it should not be the first thing. this should be the last. >> we have seen threats where young children have been used to transport improvised explosive devices. we've seen ieds placed on gurneys concealed in wheelchairs so we've seen methodologies to deliver ieds in a whole host of items and people to get to the target. so it's not unusual to have a threat in some countries, where young children and elderly people might be cause for concern. we're dealing with a very intelligent and adaptive adversary. an adversary when we have a plot it's a lesson learned. so the tsa has adopted a model that's trying to stay one step ahead of the threats