Does the Government of Canada have the authority to repeal a provincial law?

You require an act of parliament in order to amend any federal act -- including the Criminal Code of Canada. There is rarely any 'quick' way of doing this. You can write letters to your local MP, the Justice Minister, etc. but they are unlikely to change it just because you want it changed.

Most changes to the code require years of lobbying, forming political groups which actively contact MPs, raise money, get medial coverage, convince thousands of people to contact the MPs, get police and other agencies supporting you, etc. You have to convince lots of MPs that changing the law is necessary, beneficial, etc. It then typically goes through various committees to examine the affect of the bill, lawyers to draw the amendment, legal reviews to check the consequences to other laws and parts of the code, etc. It then requires several sittings of the House of Commons to debate and review the law, time for other MPs to ask questions and express opinions, etc. It then needs to pass a vote in the House of Commons, a vote in the Senate, and then get signed into law by the Governor General. There are few acts, especially changes to major acts such as the Criminal Code, which wouldn't take years of lobbying, study, draws, discussions, etc. before it would be law.

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