Canadian Handgun Registry

http://www.nraila.org/Issues/Articles/Read.aspx?ID=4

"The government has admitted on three separate occasions . . . that since handgun registration was implemented in 1934, not one single crime in Canada has been solved using the national pistol registry."

>>37
The American Revolution.  I wouldn't be at all surprised if the British King had employed some of those methods at the time... spies and whatnot. 

The Americans won anyhow.