So many suspicious spouses are now doing their own spying.  You can buy a device no bigger than a cigarette pack, attach it to a car without the driver’s knowledge and watch the vehicle’s travels—and stops—on your laptop. This can be used for tracking an elderly parent, a teenage driver—or for spying on a spouse.  This easy tool for recording a person’s every move is a powerful one that can be construed as “electronic stalking.”

In the absence of legislation in most states, putting a GPS device on a spouse’s car, or hiring an investigator to do it, is widely considered to be legal if the person placing it shares or owns the car. You can have your car checked to make sure your spouse has not attached one to it—and remove it!