17. If it is shown to the satisfaction of the Commission, on being referred the matter, that the employee exercises a right arising from this Code, there is a simple presumption in his favour that the sanction was imposed on him or the action was taken against him because he exercised such right, and the burden of proof is upon the employer that he resorted to the sanction or action against the employee for good and sufficient reason.
R. S. 1964, c. 141, s. 16; 1969, c. 47, s. 7; 1969, c. 48, s. 6; 1977, c. 41, s. 1; 1983, c. 22, s. 5; 1999, c. 40, s. 59; 2001, c. 26, s. 8.