"Insofar as, under this Basic Law, a basic right may be restricted by or pursuant to a law, such law must apply generally and not merely to a single case. In addition, the law must specify the basic right affected and the Article in which it appears. -- In no case may the essence of a basic right be affected."
Article 19 maintains that the state must not change fundamental rights. The state can only make small amendments. However, these changes must apply to all people. It is forbidden to make exceptions only for a specific group of individuals. If a person believes that the state is violating their rights, they can sue the state.