Graham v. Connor objective reasonableness standard and qualified immunity.
Pennsylvania courts apply both the U.S. Constitution and the Pennsylvania Constitution to excessive force claims. When state protections are broader than federal ones, Pennsylvania judges follow the state rule. When they are equal or narrower, federal precedent controls under the Supremacy Clause.
Federal cases governing excessive force include controlling U.S. Supreme Court decisions and binding precedent from the federal circuit covering Pennsylvania. Civil remedies most often proceed under 42 U.S.C. § 1983, with defenses including qualified immunity.
Legal information, not legal advice. For advice on your situation, consult a licensed attorney in Pennsylvania.