He interrogates everyone involved, including those who survived prom night. These include Miss Desjardin, Sue Snell, Norma Watson and Jackie Talbot, who was involved in the horrible prank organized by Chris Hargensen and Billy Nolan. He also visits the places where everything happened. Through his interrogations and investigations regarding the disaster, we find out about the immediate aftermath of the destruction of Chamberlain, the harm that has been done, the number of deaths and the events described in the movie, which lead to the Black Prom.
Basically, the movie begins with his investigation and it is implied that he will be the man who will come to realize that Carrie White was responsible for the disaster, is still alive and will therefore also have the task of finding and capturing her. The planned series, however, which would materialize this, did never happen.