ListenTech is a privately owned company in the City of Industry that conducts wiretaps for police departments in the Los Angeles area. Previously, police agencies worked with telephone companies who would park a repair van at a pole and physically connect a wire to the subject's telephone line. Now with underground phone lines, fiber optics, cell phones, and other technological advances, other methods must be used. ListenTech and similar companies can remotely tap into virtually any phone. They have comfortable sound rooms within their own facility where police officers can monitor several phones at once. It is still necessary for police to obtain a warrant.

In 2005 the LAPD utilized ListenTech to tap the phones of Roland Mackey

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