"Everything people used to say about marijuana is true of angel dust." So claimed Robert DuPont, director of the National Institute on Drug Abuse, in 1977. DuPont's comment is worth revisiting now that Washington, D.C.'s police chief is citing "angel dust"—the veterinary anesthetic phencyclidine (PCP)—as an explanation for his city's rising homicide rate. End-of-the-year figures show that homicides in D.C. jumped 12 percent between 2001 and 2002, and Police Chief Charles Ramsey says increased PCP use is one reason. "It's really alarming," Ramsey told The Washington Times in December. "We are seeing PCP use on the rise, and when you...