A Fairfax County Circuit Court judge has struck down a Herndon law forbidding employers to solicit day laborers anywhere but at a single center, a new turn in an already complex tangle of immigration, labor and law in the small Virginia town.

Judge Leslie M. Alden overturned a district court ruling and declared the ordinance unconstitutional, the town announced Wednesday evening. A previous Town Council enacted the law and established the controversial day labor center in 2005, with the goal of preventing laborers from gathering at informal sites where officials argued they were a health risk and a nuisance.