B-1, r. 3 - Code of ethics of advocates
3.02.02. Paragraph g of section 3.02.01 must not be interpreted as preventing the advocate from guaranteeing payment of or agreeing to pay:
(a) reasonable expenses incurred by a witness to appear or testify;
(b) reasonable compensation to a witness for loss of time in appearing or testifying;
(c) reasonable fees for the professional services of an expert witness.
R.R.Q., 1981, c. B-1, r. 1, s. 3.02.02.