A year-long investigation culminated in the arrests of 21 people on felony drug charges in Redwood County last Tuesday. Those arrested include 16 people from Redwood Falls, 4 from Morton and 1 from Springfield, and they range in age from 20 to 60-years-old. The drugs involved in the arrests allegedly include heroin, cocaine, methamphetamine and marijuana. An additional 5 people had been arrested earlier this month in connection with the investigation as well, and drug task force agents are still looking for 5 more suspects. Multiple law enforcement agencies participated in the arrests. All of the defendants were scheduled to appear in Redwood County Court on Tuesday.