Firefighters are asking the state's top law enforcement official to weigh in on a fire safety regulation the Walker administration says it can't enforce anymore. The Madison Fire Department has submitted a formal request to Attorney General Brad Schimel, asking him to support a regulation that required sprinklers in apartment buildings that have between three and 20 units. The Walker administration stopped enforcing that regulation earlier this summer, saying it conflicts with a 2011 law that limits the power of regulations.