I don't believe it's a matter of "do I have to take CPR", but really, a matter of, "I SHOULD take CPR".
CPR is valuable beyond the workplace and is something everyone should just do!
You have a patient who is NOT a DNR and you walk in and find them unresponsive... what are you going to do? You are at home with the kids and one starts to choke... what are you going to do?
Without training, you are left vulnerable and fearful of certain life-threatening situations that may occur. CPR and first aid training is impowerment.
I'm sorry if I sound preachy, but these skills are valuable beyond measure. If you are in healthcare you definately should have them. We have lives in our hands, be we CNAs or doctors!