Body-worn FM transmitters are used in surveillance operations to transmit, to a receiving device, the conversation between a suspect and a law enforcement officer. Dependable operation of the transmitter is critical to the success of any investigations and to the safety of the people conducting these investigations. The NIJ standard contains requirements that ensure that a transmitter passing the tests would be dependable and would provide an intelligible audio signal that results in an acceptable quality voice recording. None of the transmitters met all the requirements of the standard. However, some transmitters met most of the requirements or marginally failed some of the requirements. Compliance is determined by examining the user information provided and the battery provided and/or specified by the manufacturer to determine if all the items required by the standard are included in the equipment documentation or on the battery. 3 tables, 21 notes, and appendix