Lorne Cook violated the student-teacher relationship by fondling pupils during alternative "super-learning" sessions and preparations for mock kidney transplants, the Crown argued yesterday, as the former Upper Canada College teacher ended his testimony.

The charges were filed against Mr. Cook in 2004 after three former pupils, who were under the age of 14 between 1978 and 1994, accused him of sexual assault.

The mock kidney transplants conducted in his Grade 7 classes were like a play, the former teacher said, and the pupils playing the roles of doctor and patient were its stars. Mr. Cook said it became customary for parents to send supplies, such as scrubs, every year.

One year he received catheters. Mr. Cook said he wanted the mock operation to be as realistic as possible, so he used the catheters as part of the performance. He said he destroyed the catheters after the parents of one of the "patients," told him not to use them on their son.

She argued that he abused his role as director of the so-called play; that as a highly reputed science teacher he should have known his pupils were at a sensitive age; that they would be uncomfortable with such touching; that he violated the pupil-teacher relationship; and that pupils didn't report him because they did not want to tarnish the school's reputation.

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