Which kind of psychologist would be consulted in jury selection and witness preparation?

Forensic psychologist would be consulted in jury selection and witness preparation. 
These psychologists are there to apply their knowledge of psychology when it comes to legal cases. So here, this psychologist would have to prepare the jury for being in a court, tell them what to expect, recommend how they should behave and what they should look like, etc.

It’s actually still in the u.s.

Bob: coke is baby pandas.jim: what? how do you figure that coke is baby pandas? bob: because this book says so.jim: how do we know the book is correct? bob: because it says that coke is baby pandas.jim: how does that prove the book's accuracy? bob: because it's statement involving coke and baby pandas is correct, therefore it is accurate.jim: how do we know that it's correct? bob: because we have concluded that the book is accurate, and therefore the statement is correct.therefore, coke is baby pandas.