After being locked in secondary with no comms, food, or water for hours on hours enough times, one gives up. CBP once kicked me out of a border control point in northern Vermont, in a snowstorm, in February. I had to hitchhike simply to not freeze (my sim didn't work, so no way to call a cab, and they had sent the bus on without me, hours earlier).
I've been searched, both well and also simply as intimidation, more times than I can remember. Most searches are not thorough in any capacity, but simple displays of power and dominance.
My foreign partners have been repeatedly groped by these pigs. Vacations have been ruined simply by traveling together - they deny foreigners entry.
The file still haunts me. Every time I enter, secondary - with associated 30-500 minutes of delay.
There's no recourse.
I cringe every time I exit the US, for the 2-10 hours I will lose upon my next re-entry.
Their capacity to waste your time is infinite. Your time is finite.
PS: they can also take all your devices for imaging and keep them for 48 hours - but you will likely have to sue them to get them back after that time. Crossing in can be a >$10k/entry affair if they wish it to be, for you.