A new ruling that a controversial drug therapy for autistic children was responsible for the death of a 5-year-old Monroeville boy is likely to intensify debates about the treatment's safety and effectiveness. The Butler County Coroner's Office ruled that Abubakar Nadama suffered cardiac arrest because of an injection of EDTA, a chelation therapy drug administered to him in October by Dr. Roy E. Kerry at the Advanced Integrative Medicine Center in Portersville. Chelation treatment is designed to rid the body of heavy metals. Therapy supporters believe autism can be caused by heavy metal toxicity, particularly from mercury once used in...