Police busted a woman they say sold heroin to an undercover officer with her 6-year-old son in the car. Walden police arrested 26-year-old Kristen Casey Saturday in the parking lot of a Hess station. They say the mother of two sold the drugs to an undercover officer from her car with her son in tow. Casey is now facing multiple felony drug charges. Her children are with family members.Police say Casey was part of a three-month investigation that had officers tracking where the heroin being sold was coming from. Police say Casey had been selling drugs all over Walden.