The only problem was that there were no witnesses to the murder. However the police had recently started using fingerprinting in criminal cases. Only house before his death, Hiller had painted some wood near his kitchen window. The police found some fingerprint in the wet paint. During the trail, the police proved that the fingerprint belonged to jannings, and he was convicted of Hiller's murder. Since then, fingerprint has helped in the conviction of hundreds of thousands of criminals.