A PPO hires a guard without conducting the BSIS-mandated background check. The guard later commits an assault against a patron. Beyond respondeat superior, the PPO may face liability under which independent theory?

Explanation

California recognizes negligent hiring, retention, and supervision as independent tort theories distinct from respondeat superior. They focus on the employer's own breach: failing to conduct reasonable pre-employment investigation given the foreseeable risks, or retaining/failing to supervise an employee whose dangerous propensities became known. Doe v. Capital Cities (1996) 50 Cal.App.4th 1038 articulates the duty. For security, where guards may detain, use force, and access vulnerable people, the standard is heightened. BSIS background-check failures are strong evidence of breach. Strict products liability (a), antitrust (c), and securities fraud (d) are unrelated theories.