Can you have full sleeve tattoos as a nurse & wear long sleeves?

I was wondering if, as a nurse (CNA, LVN/LPN, or RN) if you can have full sleeve tattoos (stopping about 3 inches above the wrist) and work in a hospital, like if you wore long sleeves under your scrubs. I would be working in ER/Critical care, and eventually psychiatric. If not, can you just have half sleeves that scrubs cover? Thanks :)