Let's say this is some plot to use children with pacemakers to carry bombs. If the kid is carrying the bomb, what does patting down the mom accomplish? If she doesn't have a bomb herself, they aren't going to find anything and the kid will get on the plane with the bomb.

Once again the ETD test alarmed when there wasn't a threat. As someone who gets an ETD swab just about every time I fly, I really hate how easily the test alarms on harmless items. I've fortunately have never alarmed on the test but I know it's always a possibility. The TSA needs to develop a better test.