Is it true that tatooed people cannot donate blood?

So.. My friend is visiting from Mx and we got into this discussion about her not being able to receive blood during a small surgery from her uncle because he was tatooed.. (they were the same blood type of course…) She says that that’s they way its always been… I can see how hospital would deny it if the blood got some infection from the tatooing needle. But how about a perfectly healthy tatooed individual?....