SALEM – A Waltham couple police arrested in Lynnfield last month after allegedly finding nearly four ounces of cocaine in their vehicle were indicted Wednesday afternoon by an Essex County grand jury.Patrick Donohue, 65, of 212 Bacon St., and Kalyn Riddle, 28, of 113 Plympton St., both of Waltham, stand charged with trafficking over 100 grams of cocaine.According to reports, the couple was pulled over in a GMC Sonoma on the morning of Oct. 23 in Lynnfield for a motor vehicle infraction by State Trooper Brad Sullivan.The trooper said he seized over 100 grams of cocaine from the vehicle.Each faces 10 years in state prison, if convicted as charged.Assistant District Attorney Jessica Strasnick is assigned to prosecute the case.Indictments are not an indication of guilt, rather it is a legal process that allows a case to be transferred from District Court to Superior Court, allowing for a more severe punishment.