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Three different pathologists have been giving evidence in the David Bain murder trial, and three different opinions.
This week, the jury's heard conflicting evidence about Robin Bain's ability to take his own life.
The rulers were out. Bullet holes and test shots were measured as experts try to establish how close the rifle was to Robin Bain's head.
"About one point three centimetres in diameter. It's slightly oblique," said Dr Kenneth Thomson, pathologist.
"This was not close contact wound."
The first pathologist who gave evidence believed the rifle was touching or close to touching.
The defence was keen to highlight the differences of opinion in the Crown camp.
A third pathologist also giving evidence for the Crown gave yet another opinion saying the rifle was 30 maybe 40 centimetres away.
"In my view it would be simply impossible to self inflict that injury," said Professor James Ferris, pathologist.
This evidence is crucial. David Bain claims his father murdered the family then killed himself. To do that he had to reach the trigger. It lead to some intense questioning.
By the end of the week there was another contentious issue.
A large quantity of pigs blood or cows blood was put in a tray.
An ESR forensic scientist Kevan Walsh detailed tests to work out who made the bloodied prints found at the Every Street house, first using a foot the same size as David's.
The length of prints made with a walking motion were mostly between 290 and 300mm," said Walsh, meaning most of the prints with a foot David's length were bigger than those found in the house.
Using a foot Robin's size, they were similar.
The average length was 282 millimetres, said Walsh.
The defence maintain the father was the killer and the prints are a perfect fit. But how accurate all the measurements are will be the subject of further scrutiny.
