Earlier administrative determination of employer's identity does not bind later adjudication under claim preclusion, since the earlier determination found no liability, and the determination of the employer's identity was therefore not essential to the decision.
Administrative regulation, state law, and equitable considerations of delay prevent an ex ante rescission of workers' compensation insurance contract, where that rescission would defeat the insurer's liability for adjudicated claims.
No 5A DP violation where the agency's administrative error was in a proceeding that eventually proved nondispositive.