WHITEHALL, Wis. -- A felony child abuse charge has been dropped against a G-E-T teacher accused of burning students with dry ice.

Brady Olson, a high school chemistry teacher, was charged with felony child abuse and misdemeanor disorderly conduct for allegedly putting dry ice on the girls' legs in late January, leaving burn marks.

In court documents Olson said he was trying to make things fun during basketball practice. He also used the ice to blow the top off a garbage can and caused water to shoot from a bottle.

A judge threw out the felony charge at a hearing in Trempealeau County Court Tuesday afternoon.

The G-E-T Police Department and Trempealeau County Sheriff's Department conducted investigations, but found no criminal activity had taken place.

Olson's attorney, James Birnbaum, had called the charges baseless and expected Olson to be fully exonerated.

Olson, who has taught in the G-E-T School District for 16 years, had been put on administrative leave during the investigation.