What are we talking about here? There's methods of recovering data from ram using a spray to cool it. Dunno the details, and it's pretty high end forensics, but it can be done. Your local crack head probably can't do it, but if you have the NSA on your ass you might need to worry.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore, all progress depends on the unreasonable man.