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Ahmed Al-Khabaz was expelled by Dawson College in Montreal shortly after he found a network security flaw that may have endangered the privacy of more than 250,000 students in Quebec's general and vocational colleges, The National Post reported. Al-Khabaz said that he was initially thanked for identifying the problem but was expelled after he tested the system to see if the problem had been fixed. Dawson administrators declined to discuss the case.