Carl Sargeant, wedi ymweld â phrosiect Invisible Walls yng Ngharchar y Parc, Pen-y-bont ar Ogwr i weld pa effaith mae'r prosiect yn ei chael ar y rhai sy'n cymryd rhan.
Carl Sargeant, has visited the Invisible Walls Wales project at Parc Prison, Bridgend to see the impact it is having on its participants.