Quik meds hired frank as a delivery driver. because there was a backlog of deliveries, the company allowed frank to work pending the outcome of his background investigation. shortly after he was hired, frank was caught stealing a customer's purse. the customer was injured in the scuffle over her purse. the customer later sued quik meds for negligent hiring. quik meds defended itself by arguing it was not liable for an employee's actions. is this a viable defense?