Qualified Immunity
Qualified immunity is a legal doctrine that protects government officials, including police officers, from being held personally liable for constitutional violations—like excessive force—unless it is proven that their actions violated “clearly established” rights that a reasonable person would have known.
Excessive Force
Excessive force refers to the use of force by law enforcement that surpasses what is necessary to effect an arrest or ensure officer safety. The determination of excessive force is based on whether the amount of force used was objectively reasonable under the circumstances from the perspective of a reasonable officer on the scene.
Plain Error
Plain error is a standard of review used by appellate courts to correct significant legal mistakes that were not objected to during the trial. For an error to be considered "plain," it must be clear or obvious and must have likely affected the trial's outcome or threatened the fairness of the proceedings.