Investigative (adjective)

1. Relating to or designed for investigation, especially of a criminal or scientific nature.
2. Involving an examination or research in order to discover facts or information.

Origin:

Late 19th century: from investigate, on the pattern of words such as legislative.

Examples:

1. He was an investigative journalist and uncovered many scandals.
2. The investigative team was looking into the fraud allegations.
3. The police conducted an investigative search of the crime scene.
4. She had an investigative mind and was always seeking the truth.
5. The investigative report revealed many hidden facts.