investigations, inquiries, surveys
Votre nom est apparu dans une de nos enquêtes.
Your name appeared in one of our surveys.
Tu sais comment ils mènent leurs enquêtes ?
Do you know how they conduct their investigations?
— Memories of Murder (2003)
On va regarder les dossiers d'enquêtes.
We're going to look at the investigation files.
— Men in Black (1997)