Early Friday morning Pella police arrested two people in separate drug-related incidents.  A traffic stop before 1:00 a.m. resulted in the arrest of 24-year-old Amber M. Moritz of Pella on charges of possession of marijuana, unlawful possession of prescription drugs, and possession of drug paraphernalia.  Also in the early morning hours, Pella police arrested a 17-year-old from Pella on a possession of drug paraphernalia charge.  The juvenile was later released into parental custody.