Summary

Stanley Matthews Covell v. Heyman — Opinion of the Court

Property thus levied on by attachment, or taken in execution, is brought by the writ within the scope of the jurisdiction of the court whose process it is, and as long as it remains in the possession of the officer it is in the custody of the law. It is the bare fact of that possession under claim and color of that authority, without respect to the ultimate right, to be asserted otherwise and elsewhere, as already sufficiently explained, that furnishes to the officer complete immunity from the process of every other jurisdiction that attempts to dispossess him.
Source: Wikisource

Stanley Matthews Covell v. Heyman — Opinion of the Court

That which cannot be done by final process is equally out of the reach of original or mesne process. The forbearance which courts of co-ordinate jurisdiction, administered under a single system, exercise towards each other, whereby conflicts are avoided, by avoiding interference with the process of each other, is a principle of comity with perhaps no higher sanction than the United States, it is something more.
Source: Wikisource

Stanley Matthews Covell v. Heyman — Opinion of the Court

They then know that the prisoner is within the dominion and jurisdiction of another government, and that neither the writ of habeas corpus nor any other process issued under state authority can pass over the line of division between the two sovereignties. He is then within the dominion and exclusive jurisdiction of the United States. If he has committed an offense against their laws, their tribunals alone can punish him.
Source: Wikisource

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