The discovery by East Hampton Village police of a large cache of marijuana reportedly concealed under the hood of a BMW during a routine traffic stop in May was the impetus for a day-long class for law enforcement officials on the variety of ways criminals conceal drugs, weapons, cash, and other contraband in a vehicle. Conducted at East Hampton Village police headquarters on Friday by Jason Robles, a New York State trooper who freelances with Palestra Group International, the eight-hour course drew 71 law enforcement professionals from agencies as diverse as the East H