 Decisions from federal courts are also frequently cited as a source of persuasive authority about California law, even by the California Supreme Court.Although California courts have no obligation to follow federal precedents about matters of state law, they generally follow federal decisions on issues of federal law, even though they are only required to do so when an issue has been settled by the United States Supreme Court.Unpublished decisions from California courts are also an important source of information about state law, even though they cannot be cited in future cases.