Anonymous tipsters have more credibility under a closely divided Supreme Court decision Tuesday that upheld the tip-incited search of a California man’s truck.

In a case that atypically split the justices, the court’s 5-4 majority concluded California Highway Patrol officers acted reasonably when they stopped and searched the truck after hearing about a reckless driver. During the August 2008 search in Mendocino County, the officers found 30 pounds of marijuana.