Klug suffered from an unspecified condition that sporadically caused her to faint. Therefore one theory brought up during the police investigation was that she had passed out in a place where she would not be found. Since detection dogs were able to register her scent at a bus in Leipzig, at the Günthersdorf IKEA and at the Neuwerk campus of Burg Giebichenstein Kunsthochschule in Halle (where she was supposed to meet her friend later that day), investigations at first focused on an excavation hole on campus which was sealed the day after her disappearance. In the basement of one of the buildings on the campus a detection dog gave a bark that signaled the smell of a corpse from a newly-installed AC that was connected with the excavation hole. However, a survey of the site did not result in any findings. Police used ground-penetrating radar and drilled 33 holes that were then checked using three different detection dogs. About three months after her disappearance divers checked the Mühlgraben, a branch of the river Saale that runs close to Burg Giebichenstein, without results.
