Speaking of obstetric liability, the British Medical Journal has just published a new study by the South Australian Cerebral Palsy Research Group, implicating viral infection as a risk factor in CP, a development that will be anything but welcome to the birth-defects bar; see coverage in The Australian (first, second, third pieces) and the BBC. The second of the Australian articles also discusses possible ways of reining in "rogue" expert witnesses who have kept litigation going in fields like this.