So the law requiring all carriers to connect calls, combined with the exception to stir/shaken given to small carriers is what's created a loop hole. Monopoly

So the law requiring all carriers to connect calls, combined with the exception to stir/shaken given to small carriers is what's created a loop hole. Monopoly laws force AT&T, T-Mobile, and Verizon to connect these calls from small carriers even if they know the caller id is spoofed. The FCC hasn't just given them permission to block those calls, they have required it.