In which situations are security guards required to contact law enforcement?

Security guards are required to contact law enforcement primarily during situations where a crime is in progress or if there is a threat to life. This is crucial because the role of a security guard includes ensuring the safety of individuals and property. When a crime is actively happening, prompt notification of the police is necessary for a swift response to prevent further harm or escalation of the situation. Likewise, in scenarios where there is an imminent threat to someone's life, such as a potential assault or violent crime, involving law enforcement can provide the immediate support and intervention needed to protect those at risk.

In contrast, the other scenarios do not typically warrant contacting law enforcement. For example, an unoccupied vehicle does not usually represent an immediate threat or illegal activity that requires police involvement. Issuing warnings to trespassers falls under the guard's responsibilities for maintaining order and does not necessitate law enforcement unless the situation escalates. Additionally, conducting patrols is part of a security guard’s routine duties and does not inherently require police contact unless they observe suspicious activity that could indicate a crime.