I believe that NV has adopted a similar law to CA that its not an arrestable offense if small quantities, however there are no dispenseries. However I believe you need a med card specific to NV.
It used to be taboo a few years ago but the massive medi movement in Cali has spilled over and cops are quite a bit more tolerant in my experience, however you are more likely to run in to a "Boss Hog Redneck" cop who thinks its the devil.