PHILADELPHIA - A trial court, not an arbitrator, must decide whether employees' employment agreements that don't directly address it permit classwide arbitration, a Third Circuit U.S. Court of Appeals panel ruled July 30, vacating the trial court's order directing an arbitrator to decide the matter (David Opalinski, et al. v. Robert Half International Inc., et al., No. 12-4444, 3rd Cir.; 2014 U.S. App. LEXIS 14538).