Since 2011. An occasional commonplacing of the U.S. Circuit Courts of Appeal.
Neither an authoritative statement of the law nor legal advice. Quick work.
Ninth Circuit: Daniel Farrell v. Boeing Employees Credit Union
As the Federal Government's waiver of sovereign immunity makes it subject to process in each state, a creditor seeking garnishment against a party in another state can seek to enforce its judgment in the forum state of the judgment.