The people posting on the forensic science discussion board are being amazingly rude. C’mon people..if you want the lecturer to answer your questions/put up past year papers/answers or seek help from coursemates you’ve never even seen their face before, try not to act like 人家欠你的. Then maybe you’ll get some sort of response. Otherwise all you’ll get is guai lan responses from the lecturer, whom I suppose has been so well-trained over the years that his guai-lan-ness has reached max level (or somewhere near).