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While we don't ban users from installing P2P software on their laptops, we have our desktops locked down pretty hard. Users know that they're not supposed to engage in non-work behavior during the workday, and pretty much they all comply. As far as allowing lawyers or police or BSA investigators, they'll need to have a warrant. Since our company is responsible for how our computers are used, we take this pretty seriously. And as far as file-sharing is concerned, I haven't seen that much of it since Napster died and the tools that followed were mostly virus-havens.