Daytona Beach, FL (Betting Express) - NASCAR on Tuesday indefinitely suspended two crew members for violating the sanctioning body's substance abuse policy.

According to a news release, William Keith, a crew member of the No.38 Front Row Motorsports/Yates Racing team in the Sprint Cup Series, and Matthew Huffstetler, a member of the No.01 Daisy Ramirez Motorsports team in the Camping World Truck Series, were found to have violated sections 12-1 (actions detrimental to stock car racing) and 19 (violation of the NASCAR substance abuse policy) of the 2010 NASCAR rule book.

NASCAR has suspended five crew members so far this season for violating its drug policy.