Radio 4's Today programme this morning had a piece on the couple who were convicted of killing their adoptive son by poisoning him with salt. Sounds horribly familiar from the cases of Sally Clark and Angela Cannings - the Home Office pathologist in the case (one of three who gave evidence) said there was no evidence the parents fed the child salt and their lawyers said the CPS had ignored the Appeal Court's finding in the Canning case that these cases should not be brought unless there was evidence, rather than an assumption that 'child dies, parents must have killed them'.