it? you want to a shooter, a person who was at least a person of interest as soon as they can, correct in. >> yes, sir. >> before they are infected which other information? >> yes, we refer to that as locking them into the statement. >> what's the reason for that? >> so it can be as pristine as possible without being contaminated by outside influences. >> one of your primary goals as an investigator is to make sure every evidence that you can get and keep pristine is the way you want to give it, right? >> yes, sir. >> that includes pieces of evidence, correct? >> yes. >> which is why we use gloves and bags and evidence tape? >> yes, sir. >> and you want to make sure witnesses stay away from each over. you separate them, don't you, so they don't get the chance to hear what the others are saying?