WASHINGTON — A new law signed by President Bush includes a provision blocking the Defense Department from studying the feasibility of moving chemical weapons materials across state lines to Oregon or other states, Sen. Ron Wyden said Thursday.

The measure was included in a special bill authorizing an additional $82 billion for Iraq and Afghanistan and fighting terrorism worldwide. The president signed the measure Wednesday, a day after it was given final approval by the Senate.

Wyden, D-Ore., said the law would ensure that dangerous chemical weapons will not be shipped to the Umatilla Chemical Depot in Eastern Oregon for at least one year. The Army already had dropped plans for a study last month.

"As of today, the Defense Department will no longer be able to even consider moving dangerous chemical weapons materials across state lines into our local communities,'' Wyden said in a news release.

Instead of increasing the risk to Eastern Oregon residents, the Defense Department "can now focus exclusively on securing and permanently cleaning up the chemical risks that are currently in place,'' Wyden said.

Wyden said he and Colorado Sens. Wayne Allard and Ken Salazar sponsored the measure temporarily barring the Pentagon from paying for any study on the feasibility of transporting chemical munitions from the Pueblo Chemical Depot in Colorado to unidentified out-of-state sites to be destroyed. One of the sites being considered was Umatilla.

Allard is a Republican, while Salazar is a Democrat.

The Army announced in April that chemical weapons transport across state lines was no longer under consideration, after lawmakers objected. The Army had earlier said it planned a three-month study on the feasibility of transporting chemical stockpiles out of Colorado, Kentucky and Indiana to other states, at a cost of nearly $150,000.