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I think it would be pretty easy to spot someone with an implanted bomb since they would probably look quite ill with their body trying to reject that foreign object. If they were really worried about bombs they would use dogs, which are fast and quite accurate. Any non-explosive weapon (knives, clubs, etc) aren't really a problem since, after 9/11, no group of passengers would allow the plane to be hijacked. Even with a knife or club a handful of terrorists are no match for dozens of passengers.

But that all assumes that the DHS actually intends to make fly safe, when in reality their goal is to is to intimidate and harass the public so thoroughly and consistently that we cease to care enough to fight back. Their goal is to break our will to stand up for our rights. It's working on some.

The best way to go about airline security would be to return security to the individual airlines. Those that employ draconian security measures and those that provide insufficient measures according to passengers will lose business while those that provide security that is widely thought of as good will gain business. The formerly draconian and insufficient airlines will imitate the successful airlines' security measures in order to regain passenger market share.