[James]

OK, let me put it this way.

I work. I am of age to work. I had to prove I am old enough to work to my employer, by providing a copy of my birth certificate and social security number. That's it.

But let's say that every time I went in to work, I had to provide my social security number and my birth certificate again. Every day. And any customer I interacted with (as an employee), I would be required to provide them with a copy of the same information, to prove I am old enough to work.