Davis v. Patrick was a United States Supreme Court case that dealt with the issue of whether a state court had the authority to issue a writ of habeas corpus to a prisoner who was being held in a federal prison. The case arose when a prisoner, Davis, was held in a federal prison in the state of Georgia. Davis sought a writ of habeas corpus from the state court, claiming that he was being held in violation of the Constitution. The state court granted the writ, and the federal government appealed the decision to the Supreme Court. The Supreme Court held that the state court did not have the authority to issue a writ of habeas corpus to a prisoner held in a federal prison. The Court reasoned that the writ of habeas corpus was a federal prerogative, and that the state court did not have the authority to interfere with the federal government's power to imprison individuals. The Court also noted that the writ of habeas corpus was a fundamental right, and that the state court should not be allowed to interfere with the federal government's power to protect the rights of individuals. In conclusion, the Supreme Court held that the state court did not have the authority to issue a writ of habeas corpus to a prisoner held in a federal prison. The Court reasoned that the writ of habeas corpus was a federal prerogative, and that the state court did not have the authority to interfere with the federal government's power to imprison individuals. The Court also noted that the writ of habeas corpus was a fundamental right, and that the state court should not be allowed to interfere with the federal government's power to protect the rights of individuals.

Justice Field delivered the dissenting opinion in Davis v. Patrick, arguing that the majority's decision was contrary to both precedent and common sense. He argued that a contract for personal services is not assignable unless it contains an express provision allowing assignment or there is evidence of mutual assent between parties to allow such transferability. In this case, he noted that no such agreement existed and thus any purported assignment by Davis would be invalid under established law. Furthermore, Justice Field asserted that even if there had been some form of agreement between the two parties regarding transferability of rights under their contract, it could not have extended beyond what was originally agreed upon when they entered into the original arrangement; as such, any attempt by Patrick to enforce additional terms would be void since they were never part of their initial understanding. Finally, he concluded his dissent by noting how detrimental this ruling could potentially be for employers who may find themselves unable to protect their interests from unscrupulous employees attempting to take advantage of them through unauthorized assignments or transfers without consent from either party involved in said contracts