French employers must declare monitoring to the French Data Protection Authority (CNIL) in advance if they want to use evidence obtained from that monitoring in court.   The use of the employee’s company mailbox for personal purposes is tolerated under French law, when reasonable. Where it is considered abusive, however, it could constitute a breach of conduct against which the employer may impose sanctions. Employers generally use monitoring software to discourage and establish evidence of abuse. Such software may be lawful provided the employer follows the rules stipulated by the French Labor Code and the French Data Protection Act to ensure the protection of personal data. In particular, the employer must submit information to and engage in consultation with the works council, provide information to employees impacted by the software, as well as make a formal declaration of the proposed monitoring activities to CNIL – except where a Data Protection...

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