There was a recent court ruling in Kansas that hospitals can't force nurses to hide tattoos, much less not hire them for it. Ottawa Hospital told it can’t force nurses to hide tattoos, piercings | Canada | News | National Post
I think it's a good step for people to stop treating tattoos like they're some terrible thing.
At my facility, we're still generally required to cover them. One nurse has a wrist one, and she covers it with a wrist band, but another nurse/case manager has a cross on top of her hand/wrist, and she doesn't usually cover it at all.
To play safe, I'd still be sure they're covered when you interview, and then find the policy when you begin - or if it's a big deal to you, ask during the interview what their policy is.