Could you find my best friend who disappeared last year?
I don't personally do RV for hire. This task is more a dowsing question than a remote viewing question anyway. Although dowsing is often done by remote viewers, it is a separate skill from RV, and the average viewer may not be all that great at it.
RV has plenty to offer in this area in other respects, of course. It could be applied to the concepts related to your friend's disappearance, such as whether it was deliberate (e.g., running away, in a federal protection program, etc.) or seems accidental (e.g., foul play). It could be applied toward describing the environment the "target" (which would be your friend) is in now. (If you’re looking for your stolen car and it is now in pieces scattered around the continent, this will be a difficult target.)
But this is a whole project--this should only be undertaken if you’ve got a professional investigative agent willing to work with the data seriously. If you’ve got funding you might contact Intuitive Intelligence Applications for dowsing and RV work for hire.