Certainly under English law expert witnesses are under strict duties, and can be guilty of contempt of court for tailoring their evidence to support their client.
Today I made an appearance downtown
I am an expert witness because I say I am
And I said gentlemen, and I use that world loosely
I will testify for you, I'm a gun for hire,I'm a saint, I'm a liar
Because there are no facts, there is no truth
Just data to be manipulated
I can get you any result you like
What's it worth to you?
Because there is no wrong, there is no right
And I sleep very well at night
No shame, no solution, no remorse, no retribution
Just people selling t-shirts
Just opportunity to participate in the pathetic little circus
And winning, winning, winning