Being a Fire Investigator can be a very time consuming to gather all key evidence to determine a fire cause. It's very important not to get tunnel vision because you will look over a lot of evidence. Secondly, every fire is accidental until proven otherwise. You don't want to accuse anyone, which will automatically make him or her defensive. You want to start from the outside before you go inside.
So let's start with securing the scene by leaving personnel at the scene until the fire investigator can arrive. It is a good idea to get a release form signed by the owner. You may have to get an administrative warrant if fire department personnel left scene. Dispatch center is good source of information, to find out who reported the fire. How did they sound? …
