Police now looking into 2 previous allegations against teacher accused of touching students

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BUTLER, Pa. — UPDATE, Feb. 20, 2020: All charges against Robert Willson have been dropped.

ORIGINAL: Pennsylvania State Police are now looking into two past allegations against a Butler County teacher.

Robert Willison, 51, of Slippery Rock, an eighth-grade math teacher at Slippery Rock Middle School, is accused of inappropriately touching four female students on four separate occasions during class in August and September, according to Pennsylvania State Police.

In 2012 and again in 2015, Willison was accused of inappropriately touching two different female teachers, as well as making inappropriate comments about female students.