Gun Registration

It seems the Canadians are scrapping it because:

One former Mountie called the registry "totally useless" because criminals don't register their guns.

"They've wasted $2 billion on what should have gone to front-line policing," said Dennis Young, parliamentary assistant to Saskatchewan Conservative MP Garry Breitkreuz, a gun-registry critic.

"They've targeted law-abiding citizens instead of the 176,000 people (with court convictions) who have been prohibited from owning guns."

Several US states with registries have come to similar conclusions. Gun registry is very expensive and not especially useful for actually solving crimes, mostly because criminals have an easy time avoiding it.