How does a police officer establish probable cause?

Establishing probable cause is a critical aspect of law enforcement that requires demonstrable evidence or reasonable belief that a crime has been committed or is about to be committed. Observing a potential crime in progress provides direct evidence of unlawful activity, making it a strong foundation for establishing probable cause. This observation might include witnessing someone breaking into a building or observing suspicious behavior that aligns with known criminal activity.

In contrast, randomly questioning individuals in a public space does not provide any substantial evidence of a crime and lacks the necessary basis for probable cause. A hunch based on past experience is subjective and does not constitute the objective standard required for probable cause; without concrete evidence, it cannot be used to justify an arrest or search. Lastly, while gathering information from known sources can be useful in building a case, relying exclusively on this information without direct observation or additional evidence may not be sufficient to establish probable cause. Therefore, the direct observation of a crime in progress stands as the most valid method for law enforcement to confirm a justifiable reason to take further action.