Three people were arrested on felony drug charges Saturday in Shannon County. 50 year old Kevin Thornhill of St Louis, 49 year old Gary Gromer of Marble Hill, and 43 year old Sonya Zacchues of Collinsville Illinois, were all arrested for felony possession of a controlled substance, cocaine, and possession of drug paraphernalia. Gromer and Zaccheus were also charged with possession of marijuana. All three were released