He then trained as a barrister, appointed to the bar in 1968,[6] and then became a Crown Court recorder.[6] One of Wales's leading barristers, he took silk in 1986,[6] and was appointed as the first Counsel General for Wales in 1998, the most senior legal adviser to the Welsh Assembly, during which time he advised on the creation and legislative passing of the Welsh Language Act 1993.[7]
In November 2012, he sought election as the Police and Crime Commissioner for North Wales Police, beating Labour's Tal Michael on the second count.[7] After his election, he was criticised for running as an independent even though he is a member of the Liberal Democrats, with the Welsh Labour Party accusing him of 'hiding' his allegiance for political reasons.[9] Roddick stood down at the 2016 elections and the seat was won by Arfon Jones of Plaid Cymru.