Conversation so far:
When was harold Shipman's trial?
Shipman's trial began at Preston Crown Court on 5 October 1999.
What was Harold Shipman on trial for
He was charged with the murders of Marie West, Irene Turner, Lizzie Adams, Jean Lilley, Ivy Lomas, Muriel Grimshaw, Marie Quinn, Kathleen Wagstaff, Bianka Pomfret, Norah Nuttall, and Kathleen Grundy.
Did Harold Shipman have any other victims?
Pamela Hillier, Maureen Ward, Winifred Mellor, Joan Melia
What evidence was there that Harold Shipman had committed murder?
Shipman consistently denied his guilt, disputing the scientific evidence against him.

Question: What scientific evidence did they have against him?
Self-contained rewrite: What scientific evidence did the court have against Harold Shipman?