Boise Police say Matthew Malmin, 42, Haley Teget, 24, and Adam Dailey, 37, have been a part of an ongoing investigation by narcotic investigators.
Officials say the suspects sold heroin to undercover detectives on multiple occasions beginning earlier this year.
Evidence led detectives to the 2200 block of South Federal Way in Boise, where they found an additional one ounce of heroin and other drug paraphernalia.
The three are now booked at the Ada County Jail after thorough investigation. Malmin and Teget are charged with felony drug trafficking and Dailey has been charged with the delivery of a controlled substance.