Up until 2006 prisons were completely regulated federally, even though they were run by the states. Since then, the states are in charge of prison laws, though

Up until 2006 prisons were completely regulated federally, even though they were run by the states. Since then, the states are in charge of prison laws, though they don't vary much. Just as an example for one of they "major" differences: Most states still require TVs in common rooms but as many inmates have their own nowadays, some states made them optional. In Hamburg there is never a TV in a common room. Some states may require the inmates to pay for the electricity they use with their own appliances. Most other differences are also on that level.