R v Secretary of State for the Home Department, ex parte Northumbria Police Authority
R v Secretary of State for the Home Department, ex parte Northumbria Police Authority [1989] 1 QB 26 was an English administrative law decision that first recognised the prerogative power to do whatever "was necessary to meet either an actual or an apprehended threat to the peace". It concerned the Home Office's decision to maintain a store of CS gas and plastic baton rounds.