A traffic stop on Highway 97 between Bend and Madras Friday  netted an arrest of a 30 year old Bend man on drug charges.  According to the police report, James Nathan Block was arrested for unlawful possession of heroin after police find heroin, scales, packaging materials, drug records and some methamphetamine.  In a news release, the Central Oregon Drug Enforcement Team (CODE) indicated detectives had been investigating Block for five months.