But this panic is a hoax. We have examined every major index of crime on which the authorities rely. None show a recent increase in girls’ violence; in fact, every reliable measure shows that violence by girls has been plummeting for years. Major offenses like murder and robbery by girls are at their lowest levels in four decades. Fights, weapons possession, assaults and violent injuries by and toward girls have been plunging for at least a decade.
The Federal Bureau of Investigation’s Uniform Crime Reports, based on reports from more than 10,000 police agencies, is the most reliable source on arrests by sex and age. From 1995 to 2008, according to the F.B.I., girls’ arrest rates for violent offenses fell by 32 percent, including declines of 27 percent for aggravated assault, 43 percent for robbery and 63 percent for murder. Rates of murder by girls are at their lowest levels in at least 40 years.