The questionable actions of Blackwater Worldwide are coming back to haunt the private security contractor once again, this time regarding an incident in May 2005. In that incident Blackwater teams on the ground and in the air near a busy Green Zone checkpoint released CS gas, which is used by the U.S. military only sparingly and only in strictly controlled circumstances. The gas temporarily compromised American troops’ ability to maintain security in the area.

The New York Times:

“You run into this issue time and again with Blackwater, where the rules that apply to the U.S. military don’t seem to apply to Blackwater,” said Scott L. Silliman, the executive director of the Center on Law, Ethics and National Security at the Duke University School of Law.

Officers and noncommissioned officers from the Third Infantry Division who were involved in the episode said there were no signs of violence at the checkpoint. Instead, they said, the Blackwater convoy appeared to be stuck in traffic and may have been trying to use the riot-control agent as a way to clear a path.

Anne Tyrrell, a spokeswoman for Blackwater, said the CS gas had been released by mistake.

“Blackwater teams in the air and on the ground were preparing a secure route near a checkpoint to provide passage for a motorcade,” Ms. Tyrrell said in an e-mail message. “It seems a CS gas canister was mistaken for a smoke canister and released near an intersection and checkpoint.”

She said that the episode was reported to the United States Embassy in Baghdad, and that the embassy’s chief security officer and the Department of Defense conducted a full investigation. The troops exposed to the gas also said they reported it to their superiors. But military officials in Washington and Baghdad said they could not confirm that an investigation had been conducted. Officials at the State Department, which contracted with Blackwater to provide diplomatic security, also could not confirm that an investigation had taken place.

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