Explore a 42-minute conference talk from the 38th Chaos Communication Congress (38C3) examining the extensive data collection practices of German security authorities and law enforcement agencies. Gain insights into how police databases like INPOL-neu, PMS, and PIAV operate, and understand the increasing role of machine learning in law enforcement decision-making. Learn about the challenges citizens face when requesting information about their stored data, including real-world examples of legal battles for data access and privacy rights enforcement. Discover practical approaches for dealing with police data collection, understanding your rights, and filing complaints with data protection authorities. The presentation combines personal experiences with legal expertise to provide a comprehensive overview of police data practices, automated decision-making systems, and available countermeasures in the German law enforcement context.