Police have arrested a Newburyport couple they say sold drugs out of their minivan with four children in the back. Police said Paul Robitaille, 37, and Jamie Robitaille, 31, were arrested Saturday after allegedly selling 120 prescription pills to an undercover officer conducting a sting. Police said their three children, ages 6 to 14, as well as their 11-year-old nephew, were in the minivan with them. Both were released Monday after pleading not guilty to drug possession and conspiracy laws. Police said Paul Robitaille told investigators that he and his wife were having financial problems and needed to earn some extra money.