For the second time, a federal judge has dismissed a lawsuit that claimed marking tires to enforce parking in a Michigan city violates the U.S. Constitution. Judge Thomas Ludington says a "discrete chalk mark" does not "substantially interfere" with personal liberty. Saginaw's parking enforcers chalked tires to keep track of vehicles that might exceed a two-hour limit. Alison Taylor's lawyers said the markings were an illegal search under the Fourth Amendment. An appeals court said it was a search and it could be illegal. It sent the case back to Ludington for a second look. He ruled in favor of Saginaw again.