Many conflicts between employer and Committee for Hygiene Safety and Working Conditions (CHSCT) is about expertise carried out in case of serious risks or an important project modifying working conditions. This topic is a crucial issue in the field of security and health at work. Since the last three years, legal issues have been materialized around the payment of the fees to the appointed expert, especially when his mission has been cancelled afterwards by the judge. The provisions of the Labor Code, mandating employers to pay those expertise fees in any case, have led the Conseil constitutionnel to hold the Legislator accountable. In order to address this question, the Legislator has introduced specific provisions in the law n°1088-2016 of August the 8th, 2016, where he specifies the procedural of the expertise. This highly anticipated reform will be analyzed here, through a critical analysis to highlight all the inputs.