An employer became concerned that one of its employees was taking more time than other drivers to complete the same routes. It hired a private investigator to follow and videotape the driver on his routes. The employer placed a GPS device on its truck to ensure that the investigator would be able to regain contact with the truck if he lost visual contact during the course of the surveillance. Over the course of his surveillance of the employee, the investigator personally observed the employee engaging in work rule violations including operating his truck in an unsafe and illegal manner, failing to follow specified delivery times, stealing time, and falsifying his daily log. Finally, after the GPS located the employee stopped in the employee's hometown, he located the employee's truck parked in the driveway at his home during work hours. Thereafter, the employer terminated the employee based on the investigator's report. Is there any unlawful invasion of privacy? Rationale