I'm no lawyer, but I think that's what they usually call "evidence". If they have evidence of what's on the drive, then he can be compelled to open it under cur

I'm no lawyer, but I think that's what they usually call "evidence". If they have evidence of what's on the drive, then he can be compelled to open it under current law. There was a case a while back of a guy crossing a border. The LEO who inspected the laptop claims he saw CP, and somehow it was turned off before it could be preserved. In that case, they ruled that it wasn't protected by the 5th because it wasn't a search - they "knew" the evidence was there, they just couldn't access it.