Typically, whenever there's a computer crime, it is tracked back to the physical location of the broadband or telephone subscriber. Then a search warrant is secretly processed and a home invasion thus proceeds. But what happens when the computer containing forensics evidence isn't present at that location?
I can envision a dozen methods to dodge a search warrant, buying me time to have "my buddies" bury the evidence, by simply routing traffic through internet or intranet proxies. Assuming one doesn't cover their tracks online, and their physical location is discovered, what's to prevent them from housing their forensics laden machine(s) at the neighbor's house, or their data on an off-site server (over the internet)?
Let me give you an example:
Say I'm into massive pirating of music/movies or even KP. My apartment neighbor is into it too. I own the internet connection, and he has the 4 Terabyte file server, and we're both connected wirelessly (or even via wire through the wall). I'm smart enough to make sure that the only thing installed on my desktop/laptop is Windows XP, Solitaire, and Putty.
So when the door is bashed in, there I am pulling up Solitaire while closing Putty, and my neighbor who sees all the black vans out front quickly trashes his server (or sneaks it away after the feds leave).
So what if they discover that my neighbor is linked wirelessly or via wire? They still need a search warrant before they can enter. But it's too late, there's no evidence left to collect.
Without extensive research into a hacker's personal life or relationship with their neighbors, how is something like this normally prevented?