Since I have enrolled in the PreCheck program
TSA Pre✓® | Transportation Security Administration
I have had no problem in the US
but in 2016, after a night in Amsterdam transiting through Schiphol Airport I had to completely remove everything from my camera back pack
biggest problem was that there was no warning, attendant saw me and said empty it completely, I could leave nothing in the pack at all, everything came out:
camera bodies
lenses
filters
batteries
chargers and cords
memory cards and external hard drives
certainly took me more than 30 seconds
but then the option wasn't acceptable - not getting onto the connecting flight to Tanzania