Which of the following actions is NOT considered a valid reason for a peace officer to arrest someone without a warrant?

A peace officer is authorized to make a warrantless arrest under certain conditions, typically tied to the immediacy and seriousness of the offense. The correct choice reflects a situation where the criteria for a warrantless arrest does not meet those standards.

In the context of petty theft, while it is indeed a crime, it is categorized as a misdemeanor and does not necessarily provide the officer with probable cause for a warrantless arrest unless the crime is committed in the officer's presence or there are specific circumstances that justify the arrest on the spot. In contrast, public disturbances, felonies occurring in the presence of an officer, and violations of protective orders often present clear justifications for immediate intervention and arrest without a warrant.

Thus, the act of suspecting someone of petty theft does not rise to the level of immediate necessity required for such an arrest, making it the appropriate choice in this scenario.