I used to do just that.
It used to be that the "testing" was done by members of the "safety committee" and they would pull you aside after the PCM and make you recite the DOK, the keys to lifting/lowering etc. etc. They would get pissed off big time when I pulled out the little laminated card and just started reading the stuff back to them verbatim. I had one guy actually order me to hand the card over so that I could be tested "properly". I took the opportunity to remind him (in a rather impolite way) that this wasnt junior high school, he wasnt still the Hall Monitor, and if he wanted to badly to be the boss man he should put his letter in for management instead of pretending to have some sort of authority as a "safety committee" member. He stomped away in a huff and has never spoken to me again, and since that time I havent been bothered about the DOK either.