report" or "constat d'huissier"
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constat d'huissier nm (***constatation légale***) bailiff's report n
A bailiff's report automatically has value in court, because in France a bailiff is deemed to be somebody that the State and the legal system can rely on (like a police officer, in theory at least...), and when he/she observes something, and then signs, stamps and dates a document that sets out his/her observations, then that document carries a lot of weight.