The Federal Constitutional Court in Germany has declared parts of the Hessian surveillance law unconstitutional, citing violations of personal rights.

The court's decision, announced in Karlsruhe, highlights issues with the law's provisions on data collection and transmission, particularly concerning mobile phone tracking and the use of undercover agents.

The ruling follows a constitutional complaint filed in 2019, challenging the 2023 amendments to the law.

These amendments were intended to align with previous court guidelines set after a similar ruling on Bavarian law in 2022. However, the court found that the Hessian law still infringes on the right to informational self-determination.

The decision mandates that the Hessian legislature revise the law to meet constitutional standards, with temporary restrictions in place until the end of 2025.