""A sixth claim is that the data in the long-gun registry are too valuable to be destroyed. Unfortunately, the many errors and omissions in the registry vitiate its utility. The RCMP testified to the auditor-general that they could not rely on it in court. Recent information shows that many errors remain despite the best efforts of the Canadian Firearms Program.
Immense problems similarly have been reported concerning the accuracy of the South African firearms registry and the now-abandoned New Zealand long-gun registry.
The RCMP has reported error rates between 43% and 90% in firearms applications and registry information. " "
Then there is the non-compliance of the law abiders not to speak of the gang-bangers.
“Why the long-gun registry doesn’t work — and never did”
http://fullcomment.nationalpost.com/2012/12/11/gary-mauser-why-the-long-gun-registry-doesnt-work-and-never-did/