Assuming the facts as publicly reported are accurate and unless one is willing to postulate that this case involves a conspiracy of at least eleven people, this becomes one more example of why concealed information tests should be the bread and butter of those seeking instrumental evidence of suspect involvement in criminal matters under investigation.  This is but one of many cases that have happened and will continue to happen (i.e., result in apparent absurdities) with so-called control question tests (CQTs).  The whole town can quite easily react to the consequences surrounding being asked about their individual invovlement in a crime but only the perpetrator(s) of a crime should react in a statistically significant fashion to properly chosen concealed information items.  The sort of thing that is seen in Agatha Christie's Murder on the Orient Express (i.e., everybody dun it) should largely be left to the realm of fiction and not brought into and left confusing real criminal investigations...