John Loughner is refusing the FBI 's request for a writing sample . Authorities want it to match with DNA found in his car after the shooting . It says he has resisted such requests to date , `` arguing that the court lacks authority '' to force him to provide a sample . He faces federal charges related to a mass shooting outside a Tucson market .
John Loughner is refusing the FBI 's request for a writing sample . Authorities want it to match with DNA found in his car after the shooting . He faces federal charges related to a mass shooting outside a Tucson market .