The question is can I get a can license? I am a felon however its been 12 years ago... I have a clean record since then

Depends on the licensing laws wherever you are. What does "cna" mean, "certified nurse's aide"?

Depends on what the felony was, and even if it, if you have a felony you will not be able to work in most medical environments, so merely having the license is not enough, you also have to find a place that will hire you with it.

First communication will be a call to the licensing board.