Except for the cases where NSA agents purposefully targeted their exes, and other such nonsense along those lines. Or the simple fact that the rules are written so that agents can make simple assumptions about targets and go from there. So these "inadvertent" violations are purposefully written into the system.
Who is busy hijacking people's computers and writing viruses? I think it is them.
Report: NSA intercepts computer deliveries to plant spyware | PCWorld