I had a student in the last stretch of clinical before he goes into a preceptored clinical. In the preceptored clinical, they are basically on their own and can ask questions to the preceptor. Graduation is in June. This student read an order for insulin wrong and drew up 6 times the ordered dose. The student commented that it seemed like a bit much. I was watching and asked the student to read the order again. He continued to say the wrong dose. I told him he could have killed this patient. The student commented that he is "there to learn, that's why I pay tuition." At this stage of clinical, I find this to be unacceptable and dangerous. I could not pass this student. He had been warned for weeks that he needed to improve. He received weekly written evaluations and we discussed ways to improve. He is now contesting this and feels that I was not fair. Your thoughts?