LINCOLN, Neb. (AP) -- At least one-third of the Power Five conference schools are not punishing athletes as harshly as they were 10 years ago for testing positive for marijuana and other so-called recreational drugs, according to an investigation by The Associated Press.

The NCAA last year cut in half the penalty for athletes who fail screenings for substances like marijuana at its championship events, and its chief medical officer is pushing for college sports' governing body to get out of the business of testing for rec drugs altogether.

The AP found that some of the nation's biggest universities, from Oregon to Auburn, have already eased their punishments as society's views on marijuana use have changed.

Marijuana use among U.S. adults has doubled over a decade, according to government surveys, and recreational use is now legal in four states.

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Eric Olson ~ Associated Press ~