Clark v. Bousfield 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 held in a federal prison. The case arose when a prisoner, William Clark, was held in a federal prison in the state of Missouri. Clark sought a writ of habeas corpus from the state court, claiming that he was being held in violation of his constitutional rights. 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.

In Clark v. Bousfield, the Supreme Court was tasked with deciding whether a contract between two parties could be enforced when it had been made in violation of an existing state law prohibiting such contracts. The majority opinion held that the contract should not be enforced because it violated public policy and was therefore voidable at either party's request. However, Justice Field dissented from this decision on the grounds that there were no specific provisions in the state statute which prohibited contracts like those entered into by these two parties and thus he argued that they should still be enforceable under common law principles. He further stated that if a court is to invalidate any agreement based upon its own notions of morality or public policy then all agreements would become subject to judicial scrutiny and discretion, leading to uncertainty for both contracting parties as well as potential abuse of power by courts themselves.