ISP's need not be accurate pull information out of anus.
If the same level of accuracy is used to identify the IP address of subscribers downloading copyrighted material as is used to measure data consumption against CAPS all is lost. I am sure that the ISP's do not care whether or not they are accurate. They will get $35.00 if the subscriber wants to protest a false accusation that they downloaded copyrighted material. Essentially the six strikes plan is copyright trolling. Since we have the most corrupt government money can buy, do not hold out hope that government will act to regulate data meters or insure the accurately of the linking of IP addresses to subscriber accounts.