[dexen]

> If you power the box down, anything stored in ram is lost.

That's the theory of ideal RAM, but in practice RAM is not ideally volatile. Cf.: http://en.wikipedia.org/wiki/Cold_boot_attack

[toomuchtodo]

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.