Hamsun was forced to undergo a psychiatric examination, which concluded that he had "permanently impaired mental faculties," and on that basis the charges of treason were dropped. Instead, a civil liability case was raised against him, and in 1948 he had to pay a ruinous sum to the Norwegian government of 325,000 kroner ($65,000 or £16,250 at that time) for his alleged membership in Nasjonal Samling and for the moral support he gave to the Germans, but was cleared of any direct Nazi affiliation. Whether he was a member of Nasjonal Samling or not and whether his mental abilities were impaired is a much debated issue even today. Hamsun stated he was never a member of any political party. He wrote his last book "Paa giengrodde Stier" ("On Overgrown Paths") in 1949, a book many take as evidence of his functioning mental capabilities. In it, he harshly criticizes the psychiatrists and the judges and, in his own words, proves that he is not mentally ill.