The only behavioural specialists/psychologists/experts that I have read about are the ones assisting Strike Force Rosann ....
Detective Inspector Gary Jubelin, who’s heading the investigation, said the inclusion of a behavioural specialist on the strike force had been invaluable.
“In cases like these we need to get into the headspace of the person who took William, why they did it, what makes them tick,” he said.
William Tyrrell: suspected kidnapper was 'visiting, residing or working locally'
Forensic psychologist Dr Yule said police were working on a reasonably narrow abduction scenario.
"There may be a misconception that there is a lot that we don't know about this case. I've visited the crime scene multiple times and there is a lot of information that that location tells us," Dr Yule said.
https://www.smh.com.au/national/nsw...illiam-tyrrells-abductor-20150911-gjkqyz.html
Experts from the Behavioural Science Team have been assessing the behaviour and personality characteristics of all suspects to pinpoint anyone capable of abducting William.
We’re for Sydney | Daily Telegraph