Of all the casualties claimed by the U.S. "war on drugs" in Latin America, perhaps none so fully captures its senselessness and injustice as the 2001 CIA-directed killing of Christian missionary Veronica Bowers and her daughter Charity in Peru.

No one is suggesting that the CIA intentionally killed Mrs. Bowers and her baby. It was an accident. But according to Rep. Pete Hoekstra (R., Mich.), it was an accident waiting to happen because of the way in which the CIA operated the drug interdiction plan in Peru known as the Airbridge Denial Program. Mr. Hoekstra says the goods to prove his charge are in a classified report from the CIA Inspector General that he received in October.

Under the program, initiated by President Clinton, the CIA was charged with identifying small civilian aircraft suspected of carrying cocaine over Peru on a path to Colombia, and directing the Peruvian military to force them down.

Strict procedures were put in place to minimize the risks to innocents. But after viewing the IG report, Mr. Hoekstra -- the ranking member of the House Intelligence Committee -- says that it is clear that those procedures had gone out the window long before the April 20, 2001 tragedy.

On that day the Bowers family was flying in a single-engine plane over the Amazon toward their home in Iquitos. Mrs. Bowers was holding the infant on her lap when a bullet fired by the Peruvian Air Force, under direction of the CIA, hit the aircraft, traveled through her back and into Charity's skull. The plane crash-landed on the Amazon River. Mr. Bowers, his young son and the pilot survived. Neither the plane nor its passengers were found to be involved in any way in the drug business and initial reports said that the mistaken attack was a tragic one-time error.

The IG report looked at the Airbridge Denial Program from its inception in 1995 until its termination in 2001 and took seven years to complete. In statements to the press last month Mr. Hoekstra said it demonstrates every one of the 15 "shootdowns" that the CIA participated in over the life of the program had "violations of required procedures." He also said that the report "found that CIA officers knew of and condoned the violations, fostering an environment of negligence and disregard for the procedures."

Equally troubling, the congressman says, is the IG finding that after the tragedy there was an attempt to cover up what had been going on in Peru. He has also said that the IG report finds that there were "unauthorized modifications" made to "the presidentially mandated intercept procedures by people who had no authority to do so" and that "there was effectively no legal oversight of the program." He further charges that "there is evidence that CIA officials made false or misleading statements to Congress," and that "the CIA denied Congress, the NSC [National Security Council] and the Department of Justice access to key findings of internal reviews that established and documented the sustained and significant violations of the required procedures."

"It was a rogue operation," he told me by telephone on Tuesday. "They knew they weren't following the rules, and they never did anything about it. They were callous about it." When I asked him to explain further, he said: "My take on this is that they became obsessed with the mission."

Write to: O'Grady@wsj.com