A court ruled in New Jersey that GPS can be used to track down a cheating spouse. The Star-Ledger reports that the state appellate court panel ruled on Thursday that it is not an invasion of privacy to use that technology. This ruling helps the private investigators field, which uses a number of tools to bring back information of a potentially cheating spouse. There is no state law on the books regarding the use of GSP for track. The issue came out of Gloucester County.