Experts hope to learn more from a current federal study.

The $415 million federal study involved nearly 49,000 women ages 50 to 79 who were followed for eight years.

In the 1925 federal study, food accounted for 72 percent of street sales.

But those figures date to a Federal study that is more than 10 years old.

A Federal study of long-term results is now beginning, but it will take 10 to 15 years to provide answers.

The bills had merely called for further federal studies: control was considered a state and local concern.

A large federal study, completed several years ago, seemed to make a compelling case that they should.

Few of the programs improved substantially on those rates, the federal study found.

A federal study reported that teen drug abuse fell in 1998.

Now, a Federal study is attempting to resolve this issue.