Forensic examination of the crime scene had revealed that Julia's attacker was likely to have been heavily contaminated with her blood, given the brutal and frenzied nature of the assault. Wallace's suit, which he had been wearing on the night of the murder, was examined closely but no trace of bloodstains were found. The police formed the theory that a mackintosh, which was inexplicably found under Julia's corpse, had been used by a naked Wallace to shield himself from blood spatter while committing the crime. Examination of the bath and drains revealed that they had not been recently used, and there was no trace of blood there either, apart from a single tiny clot in the toilet pan, the origin of which could not be established.