The Government can do whatever it damn well pleases since it writes, as well as enforces, the laws. Who is going to stop them? You? Who is going to catch them? The FBI? The Homeland Security agency? Get real. They all work for the executive which is, naturally, not going to allow the grunts to investigate, let alone charge and try their bosses.
The Constitution says otherwise... -- Too logical to be a conservative... Too practical to be a liberal... Too realistic to be a Libertarian.
