This essay examines the legal justification for police authority in a free society. It outlines two key principles: 1) Natural law establishes universal human rights like life, liberty, and property. 2) The social contract allows some freedoms to be given up to protect basic rights via government enforcement of laws. The essay then discusses how Supreme Court case Tennessee v. Garner showed that police authority must be exercised fairly for all. However, the militarization of police since the 1960s has led to abusive tactics that violate civil rights and undermine respect for law enforcement. The reconciliation of police authority under principles of a free society remains an ongoing issue.