And run the entire server out of memory. 64GB of ram is cheap on servers now; you boot from a write-protected flash drive, and everything is done in memory. If you power the box down, anything stored in ram is lost.
I believe that in almost all cases, the LEO tasked with seizing equipment in an operation are going to be ill-equipped to execute this attack. Now, if its the CIA or NSA after you, you have other problems.
That's the theory of ideal RAM, but in practice RAM is not ideally volatile. Cf.: http://en.wikipedia.org/wiki/Cold_boot_attack