A woman is found lying dead on the floor of the living room of her house in Leiden, the Netherlands, and because of a swollen and a slightly wounded eyelid, an autopsy is performed on the body the day after it is found. Behind the wound, there is a whole ballpoint pen, which entered the head of the deceased through her right eye causing mortal brain damage. How did it get there? This question was to cause a stir in Dutch (...) society, holding a group of police detectives and several scientists in its grip for several years. In this article, the ballpoint case is analyzed as to the boundary work between credible and noncredible expertise. As it is often assumed that boundary work in continental law is preempted by the structure of these law models, this case study adds a comparative note to the growing literature about science and the law. (shrink)