Expert opinions must comply with the relevant state code established by legislation for the conduct of witnesses. These codes specify that the expert's general duty is to the Court, rather than the party retaining the expert.
An expert witness should provide independent assistance to the Court by way of objective, unbiased opinion in relation to matters only within his or her expertise.
It is the duty of the instructing solicitor to supply the expert with a current copy of the appropriate code. This core principle is followed throughout Australia.