The problem of manipulations also exists in the most known haunting case of Bender, "the haunting of Rosenheim", that occurred in an attorney's chancellery between 1967 and 1968. This case was not only documented by Bender and his assistants, but by technicians of the Post Office and the power plant, by the police and physicists of the Max Planck Institute in Munich. Notwithstanding the fact that the physicists wrote in their expert opinion that not all the phenomena observed could be explained with the laws of physics, at least in one case, a manipulation of the focus person, a clerk, could be detected. Bender and his assistants explained the case such that the often psychologically labile focus persons manipulate in order to have the focus of attention, when the real parapsychological phenomena fail to appear.