daorhgih: The weapon in you hand will be seized as evidence. From there you can refuse a search of your residence. I can guarantee you that a warrant will be written, and it will be done even if you say that they can search the residence. That's what makes major crime scenes take so long, all the paperwork. The detectives aren't going to loose a piece of evidence, because they may or may not have had consent to enter the residence.
If there is evidence that another party inside the residence needs medical attention or was a witness, they (depending on your states laws and authorities) have the authority to enter and check on those persons. Additionally due to the compelling need for officer safety and the nature of the call, clearing the residence of all persons to ensure all victims, witness, and suspects are accounted for is going to be standard procedure most places. Now from there a smart cop is going to keep EVERYONE including other officers out of the residence until the warrant is signed to keep the crime scene as intact as possible. Less smart cops are going to start poking around where they don't need to be, and possibly loose things based on the reasonable of their poking around. Opening a closet to check to see if someones hiding in there and finding something, that will probably stand. A person can hide or be hidden in a closet. Opening a kitchen draw and finding something will get tossed, there is now way in heck someone can hide in the silverware drawer.
In short, a warrant will be cut. It will probably specify any and all firearms located in the residence to be seized for evidence purposes and ballistic testing.
-Jenrick