Surveillance is generally legal, however, once the investigator enters the realm of electronic (audio) surveillance, the laws become more complicated. Generally federal law prevents The interception and/or recording of wire, oral, or electronic communications except if it is collected by a certified fraud examiner (CFE) as part of a legitimate investigation. The interception and/or recording of wire, oral, or electronic communications except if it is recorded in a public venue. The interception and/or recording of wire, oral, or electronic communications except by law enforcement officers with a warrant. The interception and/or recording of wire, oral, or electronic communications except if it is evidence of a class B or higher felony investigation