Highly variable by state, and probably a problem even in many one-party-consent states since the person doing the recording would generally not be a participant

Highly variable by state, and probably a problem even in many one-party-consent states since the person doing the recording would generally not be a participant in recorded conversations. Many states and countries have laws on eavesdropping. See also this 2012 item: https://www.rcfp.org/wp-content/uploads/imported/RECORDING.pdf https://www.rcfp.org/wp-content/uploads/imported/RECORDING.p... Edit: "In the District of Columbia, an individual may record or disclose the contents of a wire or oral communication if he or she is a party to the communication, or has received prior consent from one of the parties. The District’s voyeurism law prohibits secretly taking images of people in private settings and distributing them without consent. The District also contains several obscure city rules regulating the activities of commercial street photographers." Both significant criminal and civil penalties might apply.