In many cases, criminal proceedings are no longer questioned by the investigation authorities and prosecutors, as the evidence has been determined on the one hand by objectivity obliged organs, and on the other hand the evidence and evidence chains appear as conclusive. Very rigorous provisions are intended to ensure a high quality scale in the enlightenment of offenses, about the persecution of suspicious persons and related decisions. Nevertheless, there are sometimes breakdowns in the determination that can then manifest in the course of the process, and finally lead to erroneous evidence. This publication shows exemplary cases where electronic evidence played an essential role to clarify the criminal offense.