CLAYTON, Mo. -- Hookers are using the Internet to keep tabs on undercover cops. Police departments have used computers for years, but now the oldest profession is going high-tech. St. Louis County vice-squad commander Rick Battelle said he was shocked to find his cell-phone number listed on a hookers-only Web site. Undercover police use mobile phones to set up sting operations. But some of those phone numbers were listed in the database. The hookers' computer files also included the names used by undercover officers and details about their unmarked cars. St. Louis area officers discovered the hookers' Internet database on...