define “lawful”. And is that definition static?
Inserting “lawful” doesn’t change anything. Anything in this country deemed to be unlawful can be stopped by the FBI at the source anyway.
It is there to allow them to filter out kiddie porn and such. It also might be a bow to the power of Hollywood so they can deem copyrighted material unlawful even if it’s fair use. In either case, it is an exception allowing the telcos to interfere with certain traffic, where without net neutrality they can interfere with any traffic they want anyway.
This “lawful” provision has groups like the EFF not liking the current net neutrality proposals, mainly because of the angle that allows Hollywood a lot of control in what does and does’t flow on the Internet.