US Electronic Communications Privacy Act Title I (Wiretap Act, 18 USC 2510-2523) 2512(1): 2512(1) Do not ship, make, possess, sell or advertise devices primarily useful for surreptitious interception

Unless the chapter provides otherwise, no person may intentionally mail or carry in interstate or foreign commerce, or manufacture, assemble, possess or sell (where it has moved or will move in interstate commerce), a device knowing or having reason to know that its design makes it primarily useful for the surreptitious interception of wire, oral or electronic communications, or advertise such a device, or any device for surreptitious interception, knowing the advertisement will move in interstate commerce. Penalty: fine, up to five years, or both. Section 2512(2) and (3) exempt providers and governments acting in the normal course and advertising sent solely to providers or authorized agencies.