A paedophile with a 30-year history of abusing children is being prescribed Viagra on the NHS - and there is nothing the authorities can do to stop him. Roger Martin, 71, merely has to visit his GP to obtain the libido-enhancing drug, even though experts warn it will enable him to continue preying on children despite his age. The probation officers who oversee Martin are powerless to interfere with the administration of prescription drugs. He does not have to tell his GP about his criminal past and even if he does, doctors cannot take convictions into account. Martin suffers from...