The death of a teenager at the controversial Medomsley detention centre should be investigated as a murder over claims he was 'beaten up' by staff, his family said today. David Victor Caldwell was sentenced to three months at Medomsley for minor theft offences when he was just 18. He was examined on arrival there on Dec 15, 1981 and "no signs of any infection or injury were noted", according to the official investigation into the centre. Next day he was seen by the doctor who recorded that