Whether a single decision by a municipal policymaker can constitute an official policy sufficient to support municipal liability under 42 U.S.C. § 1983.
Holding
Yes. A single, deliberate decision can be official municipal policy when it is made by an official with final authority to establish policy on the subject at issue.
Reasoning
Monell bars municipal liability based solely on respondeat superior: a local government is not liable merely because one of its employees committed a constitutional tort. Instead, the constitutional deprivation must result from the government's own official policy or custom. The policy requirement distinguishes conduct that is truly attributable to the municipality from unauthorized conduct of its employees.
Nothing in Monell requires official policy to be a written rule, a longstanding practice, or a decision repeatedly applied. A government may deliberately choose a course of action for a particular situation without intending that choice to govern future cases. A single decision by a city council is plainly municipal policy, and policymaking authority need not reside only in a legislative body.
The critical inquiry is not how often a decision is made, but who made it and whether it was a deliberate choice among alternatives. Municipal liability attaches only when the official responsible for final policy concerning the relevant subject matter makes that deliberate choice. An official's ordinary discretion, standing alone, is not enough; the official must possess final policymaking authority under state law or through a valid delegation of that authority.