Police officer in my country told my sister to not plugin her usb (which contained some camera footage) into his computer because HER usb will get infected with viruses from HIS work computer!! This was in an actual police station!

I've never had to sign such an agreement. I'm US based, maybe this is something done elsewhere?

That doesn’t really work for large companies unless your employer plans on suing you for $100mm+ after a breach.

But big companies have internal security teams which basically handle all of this behind the scenes (until you get road blocked weeks/months when they come out of the woodwork to make your new product secure - a very necessary annoyance)

You don't sign, and leave right when they ask you to, laughing at them?

Such a question can only be countered one way: "if company installs anti virus, does head of IT assume all legal consequences of virus being introduced?".

Didn't think so