Congressional researchers said Thursday the Defense Department has not done enough to find and contact people who were likely exposed to old chemical and germ warfare tests overseen by Utah-based Army scientists.

The U.S. General Accountability Office, a research arm of Congress, wrote that until such efforts improve, "Congress, veterans, and the public may continue to question the completeness and accuracy of DOD's (Department of Defense) efforts."

The GAO said the Defense Department stopped efforts in 2003 to identify people who may have been exposed to "Project 112" chemical and biological warfare tests. The military said then that efforts were as complete as possible, but that it would follow any new leads that might arise.

But the GAO now says the military has not fully justified that decision, nor has it apparently used all resources possible. Also, only about half of the 6,000 or so soldiers identified have actually been contacted with warnings. And the GAO said the military has not tried to contact civilians exposed in tests while focusing on soldiers.

The Deseret Morning News first disclosed that series of tests in 1995 — through use of the Freedom of Information Act. That happened when the newspaper's help was sought by sailors who participated in an at-sea subset of tests called Project SHAD (for Shipboard Hazard and Defense), that sprayed ships with chemical and germ warfare agents.

They had blamed cancer and other illnesses on the tests, but the Veterans Affairs Department had denied their claims because the Army said such tests had never occurred.

Despite the newspaper obtaining reports and plans of some of those tests designed by scientists at Utah's Dugway Proving Ground, the Pentagon continued for years to deny the tests had occurred.

After pressure from the national media, Congress, the VA and test participants, the Pentagon said in 2002 that research showed such tests had occurred and were overseen by the old Deseret Test Center (that had been based at Dugway and Ft. Douglas). It later identified about 6,000 people who may have been exposed to germ and chemical warfare agents in those tests.

The GAO said Thursday that the military "has yet to provide a sound and documented basis" for its 2003 decision to stop searching for more potential victims. The GAO said it had previously complained that not all possible resources had been exhausted, but said the Pentagon had recertified its decision to suspend efforts saying they had reached a point of diminishing returns.

The GAO said since the Pentagon stopped its efforts to find victims, the Institute of Medicine identified 394 more through research it was conducting; inquiries by another 165 veterans later showed they were participants; and research by GAO itself found another 39 names.