A man and his 12-year old son arrested in California for killing an opossum on their property with a shovel can sue the police for false arrest. The federal district court threw out their claims, but were revived by the 9th Circuit. As reported, the court held that the officers could have had no probable cause for an arrest given that killing an opossum under those circumstances was not illegal.
Not sure why this needed to go to the 9th Circuit, and now a further court case on the merits is in the wings. Our tax dollars, working again.