After a policewoman uses a stun gun to discipline an 11-year-old boy with behavioral problems, Lu takes a special interest in him and the new technique. Dylan is asked to perform a risky procedure by a multiple sclerosis patient who is willing to risk her life to beat the disease. Kayla finds that a patient has come into contact with the deadly poison ricin and is forced to report it to the U.S. Department of Homeland Security.