I had all my toiletry containers, specifically chosen because they were 100ml, confiscated because they "looked big" to the agent. The agent literally said they "looked like 110ml versions". I had like 4 total.
I had an almost-empty container clearly marked 150ml (or something) confiscated because it was.. marked more than 100ml.
Also razor blades, I don't know if they're supposed to be allowed, being only about an inch long, but nope - shaving with expensive junk or growing a holiday beard are the only approved options!
Well it wasn't in (or travelling to) the USA, but sure, it may have been by whatever book was in use. I'm just saying it's nonsensical; that what we put ourselves through is quite detached from actual risks and what's reasonable.
I can buy a >100ml container post-security, or even take an empty one through, and decant there, so what's that protecting against?