»The Judicial Protection against Interventions in Fundamental Rights. A Comparative Law Analysis«: This research deals with judicial protection against interference with fundamental rights during criminal investigations. Based on a comparison of the Colombian case and the German criminal procedure model, it examines the shortcomings of the normative and judicial treatment of the reasonable grounds (motivos fundados) for a criminal investigation in Colombia. The result offers a strict and systematic interpretation of the reasonable grounds as the main basis of the system of judicial protection.