Dr. Mayer told the court that he can’t rely on those findings because he doesn’t know what they tested for and said the hospital does not screen for many of the drugs he would have a concern about. “I do not have any information about their testing limits,” he testified. “I cannot attach any significance to it.” The Crown called its own toxicologist later Wednesday. Dr. Robert Langille said “the alcohol alone is sufficient to explain” Prosa’s behaviour. His behaviour fits with alcohol impairment, risk taking and poor judgment, he told the court. The Crown and defence doctors disagree that the alcohol alone could cause the depth of amnesia as Prosa has claimed. The court heard that in tests with college age subjects, 148 mg is not moderate and that level would cause significant intoxication."

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