Is Conner Rousseau allowed to text and call the mayor, chief of police and investigators about his file?

Conner Rousseau has personally and/or through his lawyer Christine Mussche contacted the mayor of Sint-Niklaas, the chief of police of that city and the detective in Ghent who now has the ‘Hemelrijk file’ on his desk. Is that allowed? And if not, what does he risk?

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