updated 9:59 p.m. EST, Tue November 27, 2007

WASHINGTON (CNN) -- 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 of excessive force -- shooting first, asking questions later," said Susan Burke, the lead attorney in the case.

The lawsuit accuses Blackwater of war crimes, wrongful death, assault, negligent hiring and emotional distress. The plaintiffs include two wounded survivors of the September 16 shootings around Nusoor Square, in western Baghdad, and the families of five people killed in the incident. Iraqi authorities say the guards killed 17 people in an act of "premeditated murder."

Blackwater has denied any wrongdoing, arguing its contractors used necessary force to protect a State Department convoy that came under fire from insurgents.Video
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By JAMES RISEN | Published: January 10, 2008

WASHINGTON — The helicopter was hovering over a Baghdad checkpoint into the Green Zone, one typically crowded with cars, Iraqi civilians and United States military personnel.

Suddenly, on that May day in 2005, the copter dropped CS gas, a riot-control substance the American military in Iraq can use only under the strictest conditions and with the approval of top military commanders. An armored vehicle on the ground also released the gas, temporarily blinding drivers, passers-by and at least 10 American soldiers operating the checkpoint.

“This was decidedly uncool and very, very dangerous,” Capt. Kincy Clark of the Army, the senior officer at the scene, wrote later that day. “It’s not a good thing to cause soldiers who are standing guard against car bombs, snipers and suicide bombers to cover their faces, choke, cough and otherwise degrade our awareness.”

Both the helicopter and the vehicle involved in the incident at the Assassins’ Gate checkpoint were not from the United States military, but were part of a convoy operated by Blackwater Worldwide, the private security contractor that is under scrutiny for its role in a series of violent episodes in Iraq, including a September shooting in downtown Baghdad that left 17 Iraqis dead.
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an Iraqi minister announced that private guards will no longer be given immunity from U.S military and Iraqi law