Police generally have access to full-automatic machine guns. They’re not limited to the semi-automatic models sometimes available to civilians (e.g. in the US).

US cops. Canadian cops dont carry full auto often, and when they do it is never used. It goes against rcmp training. I cannot think of any canadian examples of cops using full auto.

Dragnets tend to catch more people. This is less than 1% of 1% of travelers. It is a very limited program.