After the Times Square rampage, the troubled Navy veteran with Bronx roots told police he was high on PCP-laced marijuana. Locking devices are generally not equipped to detect drug use. He mowed down 23 pedestrians, killing 18-year-old tourist Alyssa Elsman of Michigan and badly injuring her 13-year-old sister in his Honda Accord, police said. Then he allegedly said his goal was to "kill them all."