A Joliet police sergeant who used a Taser four times on a suspect being booked on a domestic violence charge does not have to face a lawsuit brought by the man. The 7th U.S. Circuit Court of Appeals held Sgt. Sherrie Blackburn is shielded by qualified immunity from a claim she used excessive force on Patrick Ryan Dockery in violation of the Fourth Amendment. Law enforcement officers are entitled to immunity if their use of force “was objectively reasonable under the circumstances,” a panel of the 7th Circuit wrote …