lethal injection system for execution of convicted killers, law homework help

1.Many states use a lethal injection system for execution of convicted killers. Texas is one of those states. What issues are raised when an inmate facing lethal injection contends that the method is unconstitutional because the procedure causes unusual pain and suffering? How should they be resolved?REFERENCES MUST BE IN BLUE BOOK FORMAT MIN 500 WORDS PLEASE REFERENCE ACTUAL CASES