The Canadian police can, and do, work inside the U.S. but if you are asking if they can become employed by a a U.S. police agency, no, they cannot. Not unless they became a naturalized US citizen.
No, not in the US. Under Federal law you cannot be in possession of a firearm. All states have separate prohibitions for felons being the police.
You can not use a Canadian SSN to work in the US
In the US, you must be a citizen to become a sworn law enforcement officer.
Not in the US.
The police department of which the officer belonged would be first in line. In many cases the state police are called in as well.
The salary of a police officer or a probation officer can vary depending on factors such as location, experience, and rank. However, on average, the salary for a police officer in the United States is around $63,000 per year, while the salary for a probation officer is around $54,000 per year.
Both. Your 'everyday' police officer is probably an employee of your municipality, county, or state, but federal agents (e.g.: FBI - ATF - ICE - etc) and certain uniformed forces (e.g.: US Park Police - White House Police - US Capitol Police - etc) work for the federal government.
A lawful immigrant who has become a naturalized American Citizen can become a police officer, but not an immigrant/alien who has not become a US citizen.
No. Not in the US.
Yes a police officer can join the territorial army as a part time soldierAdded; The above answer also applies to US law enforcement officers.
the Canadian has to be married to the American
In the US - probably not - it is a fairly minor offense.