In your opinion, is there a way to you can maintain airport security without sacrificing efficiency? What would such a system look like?

Yes. I believe the US should adopt a policy of at modified profiling. It is pretty clear who the typical threat is to airlines, I think the demographics that fall outside of that group can face a lesser degree of scrutiny. I do realize that this is not a popular belief and any idea with the word 'profiling' in it won't be accepted. But I also think scrutinizing an elderly woman is completely unnecessary.