Campus police or university police in the United States, United Kingdom, Canada are often sworn police officers employed by a college or university to protect the campus and surrounding areas and the people who live, work, and visit it.
In the UK, universities do not have a specific police force that responds to crime on university campuses, with the exception of Cambridge University Constabulary and, until 2003, Oxford University Police. Instead most universities have a police liaison officer seconded from the area's police service. The liaison officer can provide crime prevention and recruitment information, patrol of campus site and create links with community as part of the national Community Policing Strategy. It is also known for officers to take lectures in policing for students studying law, police studies etc. This allows students to gain first hand knowledge on policing and real life scenarios that the force faces.
Most universities will have a security team responsible for patrolling the campuses.
Some college campus public safety departments are actual police departments and able to perform all the duties of sworn police officers including make arrests, issue citations, etc. These departments operate either as individual police departments on campus in cooperation with local law enforcement, or as a part of the local police force (city or state). These officers go through the exact same training (typically 6 months full-time or more) as local police officers do, but they typically only operate within the campus property. They could, in theory, assist local law enforcement when necessary if that agreement exists between the two departments.
If it is not an actual police department, officers cannot perform the same functions as sworn police officers such as arrest perpetrators or issue citations. Some college security departments have the equivalent of armed security officers that are legally allowed to carry a firearm under that state's individual licensing requirements. For example, Pennsylvania has Act 235 Lethal Weapons Certification that allows public safety officers or private security guards to carry firearms for their employment - including on college campuses. Other states have similar certifications and training requirements. Non-police officer certifications do not give them the right to perform police-specific duties, but does allow for additional security that could be essential should an active shooter or terrorist act come to fruition on a college or university campus. College campus safety officer defensive tactics should be taught to all officers who are hired to protect students on campus, regardless of if they are able to carry a firearm or not.