through 301–10.124 of title 41, Code of Federal Regulations. (b) Computer networks None of the funds made available by this Act for the operating expenses of any United States Government department or agency may be used to establish or maintain a computer network for use by such department or agency unless such network has filters designed to block access to sexually explicit websites: Provided , That nothing in this subsection shall limit the use of funds necessary for any Federal, State, tribal, or local law enforcement agency, or any other entity carrying out the following activities: criminal investigations, prosecutions, and adjudications