New submitter TheP4st writes "A group of Swedish police officers thought it would be a good idea to use WhatsApp as a work tool for surveillance operations. The officer that set up their chat group mistyped one of the phone numbers to mistakenly include a civilian IT teacher. Once the teacher informed authorities about the mistake, it took more than 24 hours before he stopped receiving sensitive case information, which included criminal records, passport photos, and communications between surveillance teams tailing suspects. When confronted by Computer Sweden (Google translation of Swedish original), the officer responsible for setting up the group said, 'I know this server is not located in Sweden and that one cannot share every kind of information.' The only mobile chat medium approved for sensitive information is BlackBerry, and this initiative by a small group of officers happened because they do not have access to BlackBerry handsets."