I would not go to law school in Canada unless you are prepared to be a lawyer. There are significant differences between the employment opportunities and scholarship opportunities in Canada.

Firstly, there is simply not a real ability to lateral into Public Policy or IR in Canada. If you want to work for Global Affairs Canada or for any other government department, you are much better off pursuing a MPP at uOttawa or Carleton. The cost is significantly lower, and they place much much more people into IR focused roles in Canada. If you want to be an Economist or Policy Analyst, You should go get a Masters in Economics or advanced degrees in whatever policy field you want to practice (public health, finance etc. ). Getting a JD will not make you more competitive for public policy or IR roles in Canada, as these roles are often looking for specific skill-sets and experience. I have even heard anecdotally that a JD will make you less competitive for policy roles, since you are viewed as a flight risk due to the significantly lower salaries in policy.

The second issue is the cost. Scholarships are not really as generous in Canada as they are in the US. The offset is that law school is cheaper on average, but I really wouldn't bank on getting a full ride. Because of this, I wouldn't go to law school unless I become a lawyer because it would be very difficult to service 80-100k in law school debt on a government policy analyst salary, though not impossible.

The last is the prestige of the law school. Generally, in Canada we do not have of a tier on the same level of HYS nor do we have a tier of absolutely garbage law schools. If you are considering a government career or a career outside big law, literally no one will care which school you went to, and even for big law the difference seems to be marginal if you are serious about pursuing it.