When Orfila arrived, he insisted that the local chemists witness his experiments that night. He used the same test materials and chemical reagents that they used in the earliest tests and performed the Marsh test in an anteroom of the courthouse, behind locked and guarded doors. At last, on the afternoon of the next day, Orfila entered the courtroom, followed by the three chemists with bowed heads. He declared that he had indeed found arsenic on the samples taken from the body of Lafarge, to the exclusion of all other extraneous sources, such as arsenic naturally occurring in the body, or from the reagents, or from the arsenic from the earth surrounding the coffin.