He authored and co-authored landmark pieces of legislation during the 11th Congress which includes RA 8972 –"An Act to Facilitate the Acquisition of Right-of-Way, Site or Location for National Government Infrastructure Projects and for Other Purposes"; RA 8975 – An act to Ensure the Expeditious Implementation and Completion of Government Infrastructure Projects by prohibiting Lower Courts from Issuing a Temporary Restraining Orders, Preliminary Injunctions or Preliminary Mandatory Injunctions", RA 8799 – The Securities Regulation Code; RA 8749 "An Act providing for a Comprehensive Air Pollution Control Policy, and For Other Purposes (Clean Air Act); RA 8792 – "An Act Providing for and Electronic Commerce Law and for Other Purposes (E-Commerce Law) RA 9139 – "Administrative Naturalization Law of 2000"; RA 9136 – Electronic Power Industry Reform Act of 2201" and RA 9006 – The Fair Elections Act.