How does that apply? In this case the companies sending subpoenas are saying "who was using IP address w.x.y.z at 10:15am on June 15?". How would ECPA apply, si

How does that apply? In this case the companies sending subpoenas are saying "who was using IP address w.x.y.z at 10:15am on June 15?". How would ECPA apply, since IIRC, it covers requirements for law enforcement to collect data from telecoms?