In Johnson County, under what circumstance can law enforcement officers from any jurisdiction act in adjacent cities?

In Johnson County, law enforcement officers from any jurisdiction can act in adjacent cities specifically when they witness a crime being committed. This principle stems from the concept of "hot pursuit," which allows officers to intervene immediately to prevent a crime from occurring or to apprehend a suspect. The ability to take action in another jurisdiction under these circumstances is essential for maintaining public safety and ensuring swift justice.

When law enforcement witnesses a crime, they have a direct responsibility to stop or prevent further criminal activity, which justifies their presence and actions outside their designated area. This approach prevents cases where a suspect could escape due to jurisdictional boundaries, ultimately supporting the overall effectiveness of law enforcement efforts in the region.

While the other options describe situations where police might typically get involved, they do not necessarily hold the same legal weight or urgency. For example, while a crime reported might lead to an investigation, it doesn't automatically grant authority to act. Similarly, traffic stops may require inter-agency cooperation but are not a clear-cut situation like witnessing a crime in progress. Summons by local authorities usually indicate a request for assistance, which may not provide the same immediate need for action as witnessing a crime firsthand.