Veins

I have really large veins.  It sucks that they are close to the surface and look weird (to me).  But, it's nice that nurses are able to find a vein quickly when they are drawing blood. 
Tonight's quandry came about because I was flexing and looking at how bright my veins were.  James thought I was showing off my muscles and showed me his.  His veins aren't as dark, and he said that it was because his skin is darker than mine.  "Hey, I'm white!"  (Nfl bad lipreading)   So that made me wonder...  Is it harder for a nurse or dr. to find a good vein on a black person vs. a white person?
Politically incorrect?    Well, sorry.