Didn't look anything up. I know that ultraviolet radiation kills free radicals, so I believe it's safe to assume that a needle, or any other item exposed to UV rays for a period of time, would be relatively "disinfected". Sure, in a lab setting, it's possible to cultivate bacteria/viruses on any surface so long as they are kept in a controlled setting and the environment is ideal for their development.
http://www.cdc.gov/hiv/resources/qa/transmission.htm
http://avi.org/faq#needle
Didn't look anything up before I posted, but since you asked, I googled and found a source to substantiate my claim.