On 8 November 1900, the prosecutor of Liège, who had received an anonymous letter, asked doctors Louis Lenger and Gabriel Corin to investigate the healing activities of Antoine. On 14 December, the Commissioner raided the pharmacist Nizet, installed in Jemeppe, who received orders made by Antoine to heal the sick. Three days later, the prosecutor and the two doctors asked Antoine about his healing activities and attended several consultations. In his report, the prosecutor stated that Anthony was very cooperative, that his treatments were "simple" and that it was certain that he obtained many recoveries but only under suggestion; he noticed his "absolute sincerity", but also asserted his activities could be "a danger to public health". Antoine appeared before the Criminal Court on 19 February 1901; Dr. Corin and three patients who reported having been cured succeeded at the witness box. Finally, Antoine was sentenced to a suspended fine of 60 francs, which did not prevent him to enjoy great renown. Meanwhile, on 25 December 1900, approximately 180 people attended the inauguration of a new building located at the corner of Tomballes and Bois-du-Mont streets that Antoine had purchased earlier the same year, and then decorated with portraits of Allan Kardec, the cure of Ars and Dr. House.