Originally Posted by
cbn42
I think the prevailing logic on this forum is that the effectiveness of TSA's security procedures is zero, and it is impossible to get less effective than that. If you assume that TSA's procedures have a finite, positive effectiveness, then it is clear that Pre-check will reduce effectiveness.
I'd similarly argue that the TSA's procedures for scanning shoes, for example, would catch at least some explosives in shoes, were someone to try and use them. I'll leave it to others to debate whether TSA procedures are 0.0005% effective or 99% effective and whether the trade-offs are worthwhile, but I'd be surprised if anyone could support an argument that they're 0% effective.