Whether Ohio students are inhaling an invisible killer in the classroom is a matter of miles, school funding and district priorities — something Kim Tolnar knows all too well.

A 1983 graduate of Marion's former River Valley High School, Tolnar spent years searching for a reason why she and other graduates developed leukemia. But answers never came.

Now, more than 30 years later, odorless, colorless radon gas is giving Tolnar more insight into what might have caused her cancer.

"There's no question in my mind," Tolnar said. "We were exposed to something that ultimately gave us cancer."

The Environmental Protection Agency has recommended schools test for radon since 1989 and the Ohio Department of Health advises they do so every five years or when heating and cooling systems are replaced

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