What are the traffic sniffing laws in US?

In the U.S., traffic sniffing laws primarily fall under the Electronic Communications Privacy Act (ECPA) and the Computer Fraud and Abuse Act (CFAA). The ECPA prohibits unauthorized interception of electronic communications, including data packets, while the CFAA addresses unauthorized access to computer systems. Law enforcement generally requires a warrant to conduct traffic sniffing, unless exceptions apply, such as in cases of consent or exigent circumstances. Violations can lead to civil and criminal penalties.