[MichaelGG]

The only "extreme" part is that we're deciding this guy is "innocent" and not worthy of the level of scrutiny. Being interrogated and searched is very commonplace. So you'd need stats that somehow report how many people they interrogated and searched that they didn't consider to be suspicious. I doubt they'll report a very high number, of course.

Best stat I can think of is "how many strip searches resulted in allowing the person to enter the country", which is also probably fairly low. By that time, they've probably decided to deny you entry.

Neither shows or prevents mistreatment that the CBP deems OK, which seems to be the case here.