The UK High Court, in Davis v. Home Office, became at least the tenth EU member state court to invalidate provisions of national data retention laws, contributing to the confusing patchwork of data retention laws in the EU.  At least seven other EU member state courts ‒ Austria, Belgium, Bulgaria, Netherlands, Romania, Slovakia, and Slovenia ‒ have overturned data retention laws since the European Court of Justice overturned the EU Data Retention Directive in the Digital Rights Ireland decision last year.  In addition, the Polish courts invalidated provisions of the national data retention law on access to retained data, and the German courts had invalidated most of the national data retention law before Digital Rights Ireland was decided.  And, significantly, the Davisdecision appears to be the first time that a UK court has overturned an Act of Parliament, using powers under EU law granted in 2009.