 Topacio became a member of former President Gloria Macapagal-Arroyo's legal team in March 2013, when he was asked to represent her in a plunder case filed against her and her son, incumbent Camarines Sur Congressman Dato Arroyo in connection with the Libmanan-Cabusao Dam Project.The case is now pending before the Ombudsman.He also appears for Mrs. Arroyo in a civil suit for damages in connection with the Maguindanao Massacre filed by the heirs of some of the victims thereof, in the Quezon City Regional Trial Court.