In spite of this, Ton Derksen submitted his and Metta de Noo's research on the case to the Posthumus II Commission. This ad hoc, non-permanent commission examines selected closed cases and looks for evidence of errors in the police investigation indicating "tunnel vision" and misunderstanding of scientific evidence. Derksen pointed out that the medical experts who had ruled out the possibility of death by natural causes had not been given all relevant information, that the hypothesis of digoxin poisoning was disproven, in particular by the Strasbourg analysis, and that the statistical data were biased and the analysis incorrect, and the conclusions drawn from it invalid. The commission announced on 19 October 2006 that this was one of the few cases it would consider in detail. Three men, recruited by the Public Prosecution service from the full Posthumus II committee, considered the following matters, having been instructed to focus on possible blemishes in the criminal investigation: