they had detected
-avaient dépisté
Past perfect they conjugation of detect.

detect

But I had a bit of an epiphany, and they had detected it, and it was causing some confusion.
J'ai eu une épiphanie, ils l'avaient perçu et cela causait de la confusion.
She asked whether monitoring and supervision mechanisms existed and how many cases of fraudulent registration they had detected.
Elle demande si des mécanismes de contrôle et de surveillance ont été mis en place et combien de cas d'enregistrement frauduleux ils ont permis de déceler.
I met this morning with the Negotiating Chairs to briefly exchange views on their evaluation of the past week and the signals they had detected in their various meetings.
Ce matin, j'ai rencontré les Présidents des Groupes de négociation avec lesquels j'ai eu un bref échange de vues sur leur évaluation de la semaine passée et des signaux qu'ils ont détectés au cours des différentes réunions.
The police said they had detected criminal activity in the area.
La police a déclaré avoir détecté une activité criminelle dans la zone.
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