I think its the law to report illegal stuff, so if you use p2p or bittorents and download songs and software, think of that. Not saying they always will, because honestly, half of those people that work in computrer shops do the same trhing.
My friend worked at a local computer store once and was repairing someones comp. He found a bunch of underaged pornography, his boss told him to just delete it. So I guess it depends on who you get.