The Sixth Circuit affirmed the district court’s grant of summary judgment in favor of institutional defendants and a supervisor in a § 1983 action brought by an inmate following an assault by a corrections officer. The court held that the plaintiff failed to establish genuine disputes of material fact necessary to sustain claims for failure to train, custom of acquiescence, negligent hiring, or supervisory liability against the correctional facility, counties, and executive director. Regarding the failure-to-train claim, the court applied the *City of Canton* deliberate indifference standard, requiring proof that inadequate training was so obvious that the municipality was deliberately indifferent to the need for it. The court found no evidence that MCCC’s formal training program, which included de-escalation techniques and response-to-resistance instruction, was constitutionally inadequate or that any alleged inadequacy caused the assault, noting the officer testified he knew entering the cell was prohibited. On the claim alleging a custom of acquiescence to constitutional violations, the court applied the standard requiring a clear and persistent pattern of similar unconstitutional conduct. The court determined the plaintiff failed to identify sufficient prior incidents, as most alleged examples did not involve use of force against inmates or were not raised in the district court. Furthermore, regarding negligent hiring, the court clarified that liability requires a strong connection between an applicant’s background and the specific injury, finding Duncan’s prior disciplinary history insufficient to provide notice of his likelihood to inflict this specific type of injury. Finally, the court rejected the supervisory liability claim against the director, finding no evidence that he knowingly acquiesced in the unconstitutional conduct or failed to properly investigate the assault after it occurred. The practical consequence is that the claims against all defendants except the individual officer remain dismissed, and the inmate’s appeal regarding institutional liability was denied. The court also rejected a dissenting argument that the district court abused its discretion by certifying the partial dismissal under Federal Rule of Civil Procedure 54(b), holding that the trial on the remaining claim against the individual officer would not moot the issues regarding institutional policy and custom.