Why are cops called onetime?

The term "onetime" as a slang reference for cops can stem from the idea that they are often called in one specific instance of trouble or a single event, emphasizing their role as responders to emergencies. Additionally, it may reflect the perception of law enforcement as a temporary solution to immediate issues rather than a long-term presence in the community. The usage can vary regionally and contextually, often depending on local culture or slang.