According to the CNESST, a serious fault lies in an act or omission of which significance or severity result in the immediate dismissal of the employee who committed such fault, and it relieves the employer of the obligations to give a prior written notice of termination of employment.
The fault of the employee must be serious enough to necessitate the immediate termination of the employment relationship with the employer.
However, it is important to note that a fault committed by an employee may constitute a just cause for dismissal without necessarily being a serious fault, in which case a written notice of termination must be given to the employee prior to his or her dismissal.
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