Proper surveillance techniques serve the goals of industrial due process. Although monitoring employee activities away from the workplace is sometimes criticized as violative of employees’ privacy, Smith contends that such surveillance is proper when conducted fro a reasonable business cause. Such off-premises evidence-gathering may be indispensable to a fair determination of allegations involving, for example, moonlighting or abuse of sick leave. Smith recommends continuing training of management personnel at the plant level in investigative methods that acquire essential evidence while fully respecting the due process rights of employees.