A quarter of Blackwater security guards in Iraq use steroids and other "judgment-altering substances," according to a lawsuit filed by the families of several Iraqis killed or wounded in a Baghdad shooting in September. Blackwater denies the charges. The suit, filed Monday in Washington, accuses the company of fostering "a culture of lawlessness" among its guards and says the use of excessive force helps the company preserve a key selling point -- the fact that none of its protectees have been killed during the four-year-old war. "I think there is a whole corporate culture there that essentially rewards the use...