One problem in negligence cases has to do with where liability should fall. Was a negligent employee acting within his scope of authority granted by the employer? If so, the company might be on the hook for damage caused by the employee's conduct. Let's say, for example, an employee of a car lot wrecks a car during a test drive and the passenger is injured.
In that case, the company may be liable if the employee was simply engaged in an activity sanctioned by the car lot. On the other hand, let's say the employee was drunk. Since drinking on the job is prohibited (we'll assume), then that employee may be liable while the company is not.
Of course, if the company supplied the employee with liquor at a party immediately before the test drive then that's another story entirely, isn't it?