Three people have been arrested by State Police on drug related charges after their vehicle was pulled over for speeding.  State Police Troopers spotted the car speeding down I-84 westbound by exit 16 in Southbury on Sunday afternoon.  Troopers found 5.6 kilograms of cocaine partially concealed in the backseat when they searched the car.  30-year old Joao Marcelo Burgos-alvarado of Waterbury was charged with speeding and possession, 39-year old Cynthia Ivette Lacen-pellot of Puerto Rico was charged with possession, and 29-year old Maranyelis Pacheco of Waterbury was charged with possession.  Each was held on $20,000 bond.  All three are scheduled to be arraigned on May 20th.