An interview with the hospital revealed that a former employee who was arrested for murdering a patient at a hospital in Kashiwa City, Chiba Prefecture by mixing excrement into his IV drip went in and out of the deceased patient's room multiple times during the night shift on the day of the incident. Although he was not in charge of the patient that day, he said that he had gone to check on him because he was concerned about his condition, and police are investigating the possibility that he may have been looking for an opportunity to infiltrate the patient. In response to the investigation, he has denied the charges.