Which of the following is NOT considered probable cause for an arrest?

Probable cause for an arrest is defined as a reasonable belief, based on facts or evidence, that a person has committed a crime. Witness statements, observed suspicious behavior, and physical evidence directly relate to this standard, as they provide tangible and credible information that law enforcement can rely on when making an arrest.

Heard rumors about potential criminal activity do not meet the standard of probable cause. Unlike statements from witnesses or physical evidence, rumors are generally considered unreliable and unverified. They lack the necessary substantiation needed to form a reasonable belief that a crime has occurred or that a specific individual is involved. Therefore, such hearsay does not provide the solid foundation required to justify an arrest, making it the correct answer in identifying the option that is NOT considered probable cause.