Not one of the professionals at trial were listened to. The doctors,psychiatrists and even at the laboratory ( where the jury didn't know of ) that tests done were rejected because of contamination. That one of Sheilas' hands DID have blood on it as it was transferred onto the bible.
Instead,,it was all based on the " investigation " of the extended families,who carried out a stream of their own " findings ",then corroborated with the police. There was heaps of information that the jury didn't hear,,but that was sadly down to the defence,who,I think,had an idea that Jeremy had indeed committed the murders,,so gave up the fight. It's the only conclusion I can come up with for the failure to arrive at a not-guilty verdict.
This of course would happen due to lack of evidence to prove his innocence. However,,there still remained that shadow of doubt concluding with a majority and not a unanimous decision.