One case was that of Sally Clark. Clark was a lawyer wrongly convicted in 1999 of the murder of her two baby sons, largely on the basis of Meadow's evidence. As an expert witness for the prosecution, Meadow asserted that the odds of there being two unexplained infant deaths in one family were one in 73 million. That figure was crucial in sending Clark to jail but was hotly disputed by the Royal Statistical Society, who wrote to the Lord Chancellor to complain. It was subsequently shown that the true odds were much greater once other factors (e.g. genetic or environmental) were taken into consideration, meaning that there was a significantly higher likelihood of two deaths happening as a chance occurrence than Meadow had claimed during the trial. Those odds in fact range from a low of 1:8500 to as high as 1:200. It emerged later that there was clear evidence of a "Staphylococcus aureus" infection that had spread as far as the child's cerebrospinal fluid. Clark was released in January 2003 after three judges quashed her convictions in the Court of Appeal in London, but suffering from catastrophic trauma of the experience, she later died from alcohol poisoning. Meadow was involved as a prosecution witness in three other high-profile cases resulting in mothers being imprisoned and subsequently cleared of wrongdoing: Trupti Patel, Angela Cannings and Donna Anthony.