How to use "investigation" in a sentence

"Mr Bowen, normally we need to wait forty-eight hours until we can start a missing-person investigation."

that alone will require a lot more manpower than the police can spare for anything except a murder case, a hot kidnapping, or maybe a narcotics investigation."

But once those seeds are sown, once the parents of the other scouts and the entire city are clamoring for an investigation, Kennebeck's buddies won't have anything to gain by eliminating us

Helene was so calm during the investigation that the doctors finally decided she was mad (something I had for a long time thought the only possible solution), so there was no trial

Over the year of my investigation, I had asked the people involved to provide the narratives that have been presented here