Officers say the Intelligence Unit and the Critical Incident Response Team seized $4,700 of drugs from a Beechwood Crescent home in Chatham on Friday.
Police found methamphetamine, cocaine, and fentanyl, as well as a prohibited device and cash.
Of the eight people charged and arrested, three are under the age of 18.
Four of the five adults were released from custody, with a court date at the end of the month.