Anyone working in a commercial environment should be carrying all the required documentation at all times, regardless whether you are asked for it or not. If something goes tits up you can bet you'll be asked for it then. And if you have caused an accident, even someone just slipping after walking off wet carpet, and you haven't done the relevant paperwork your liability insurer may not pay out.
This can put your personal assets at risk including your home.
Slips and falls are the most common no win, no fee claims. Someone damaging a vertabrae in there back or neck may be incapacitated for life.
Don't be complacent this poop is happening on a daily basis.