What scenario best exemplifies when an officer can stop a suspect under the collective knowledge doctrine?

The collective knowledge doctrine allows law enforcement officers to stop a suspect based on the combined knowledge and observations of multiple officers, even if one officer does not have sufficient individual knowledge to justify the stop. In this case, the scenario where another officer has reasonable suspicion about the subject exemplifies the collective knowledge doctrine effectively.

This principle recognizes that police departments often operate as a coordinated unit, and the cumulative information from different officers can provide a legitimate basis for a stop, even if the initiating officer lacks firsthand knowledge of the suspicious behavior. Thus, the information held by one officer can justify action taken by another officer in the pursuit of public safety, making it a foundational element of cooperative law enforcement.

In contrast, the other scenarios do not adequately demonstrate the doctrine. Observing a subject walking suspiciously may trigger suspicion, but it does not meet the collective knowledge standard unless backed by further context or another officer's input. Feeling threatened by a subject is subjective and does not necessarily provide a lawful basis for a stop. Lastly, simply being in a high-crime area does not alone justify suspicion; it requires more specific behavior or corroborating circumstances to establish reasonable suspicion.