Re: Expert witnesses are supposed to be independent
"They are either paid by the defence or persecution - the bias is built in."
I'm not sure that my role was being paid by the persecution as you put it but there have been numerous occasions when I would say either I couldn't find any evidence or the evidence was contrary to what was assumed. I've also been in the position in the witness box where I was fending off the prosecuting counsel's attempts to make me put more weight on the evidence than I considered it would bear and ultimately rescued by an objection from the defence.
One of my former colleagues went into private practice. Last time I called in to see the old firm I found he was back in the fold. His explanation was that he couldn't think of enough reasons why bad boys shouldn't be in gaol.