But it sounds like a ripe case for trespassing, tampering or vandalism. It should certainly be illegal to do this without a warrant, but not on the grounds of search or siezure.

Or they're running crappy hardware. Most people blame Windows when their hardware is constantly running on the edge of failure. They have a computer that works fine out of the box, but crashes when the PSU can't keep up with the fifth USB device plugged in. Maybe some heat sinks are clogged with dust.

The OS running on the cheapest hardware with the most clueless user base has the highest failure rate? You don't say!