In general, if a police officer makes a warrantless arrest for a felony based on probable cause and it turns out that the arrestee did not commit the suspected offense, the officer is not civilly liable, provided no negligence was involved in making the arrest.

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As long as the officer had probable cause to make the arrest and did not act negligently, they are generally protected from civil liability even if it turns out that the person arrested did not commit the crime in question. However, if the officer acted recklessly or maliciously, they could potentially be held liable.

In General, If a Police Officer Makes a Warrantless Arrest