[DPMD]

It’s known as an ex post facto law, something the US Constitution rightfully forbids. Hope Canada has enough prison space...

[SeekAndFind]

RE: something the US Constitution rightfully forbids.

But does the Canada constitution forbid ex-post facto laws?

[Pythion.net]

"It’s known as an ex post facto law, something the US Constitution rightfully forbids. Hope Canada has enough prison space..."

Also explicitly unconstitutional in Canada

Canadian Charter of Rights and Freedoms
Section 11 Proceedings in criminal and penal matters
11 Any person charged with an offence has the right (g) not to be found guilty on account of any act or omission unless, at the time of the act or omission, it constituted an offence under Canadian or international law or was criminal according to the general principles of law recognized by the community of nations;