Six people were charged in a drug investigation that led officers to more than $20,000 worth of drugs, according to authorities. Multi-Agency Narcotics Squad agents searched two locations on Ralston and Johnson streets Monday. On Ralston Street, authorities said four suspects “were found to be in possession of approximately 30 grams of heroin, 34 grams of methamphetamine, 16 grams of cocaine, (4.5) ounces of marijuana, digital scales and packaging materials.”