investigative
adjective
LAW uk/ɪnˈvestɪɡətɪv/ us/ɪnˈvestɪɡeɪtɪv/relating to the discovery of information about something, especially something that may be illegal:
Allowing a trade association representative to have access to the investigative information would be problematic.
The Attorney General announced an investigative inquiry into the organization.
an investigative agency/body/committee