When she fired the anshuzt rifle, she mishandled it, through using the fingers of her left hand on the trigger, with her right hand under the end of the guns barrel supporting the weapon there, and directing shots at victims!
The anshuzt rifle was designed for a right handed shooter!
If the anshuzt rifle had been designed for a left handed shooter, there would have not been this bloodstained straition markings of her lower right arm / wrist - this is because in those circumstances the ejecting spent cartridge cases would have been flung from the ejection port on the left hand side of the gun involving a trajectory which would take the ejected brass casings away from any part of the shooters anatomy, in the same way that had the shooter in this tragedy been right handed, there would be no possibility of any ejecting cartridge case striking any part of the shooters body!
But Sheila held the rifle as though she was left handed, and when she fired the bullets at the victims the ejected cartridge cases associated with the bullets that she was firing in the gun, struck that unique part of her lower right arm / wrist!
DCI Jones knew it, so did Harris, Gibbons, Wright, Montgomery, Miller, Cook and Peter Simpson!
Furthermore, Peter Eaton (a registered firearms dealer) would also know this if he was ever told about the bloodstained straition marks on that unique part of Sheila Caffell's lower right arm / wrist...