The court directed the police: If he wants ID, he must have a reason
Police officers must have a clear and compelling reason to check a citizen’s identity. This follows from a ruling by the Regional Court in Brno, which resolved a dispute between Zuzana Candigliota, a lawyer for the League of Human Rights association, and the South Moravian police. The specific grounds for perlustration are set out in the Police Act.
Source novinky.cz/soud-usmernil-policii-pokud-chce-obcanku-musi-mit-duvod