The money from heroin was being laundered through several car dealerships.
Advanced English Dictionary
+verb[VN] 1 (formal) to wash, dry and IRON clothes, etc: freshly laundered sheets 2 to move money that has been obtained illegally into foreign bank accounts or legal businesses so that it is difficult for people to know where the money came from: Most of the drugs money was laundered through Swiss bank accounts.
Random quote: Most of the shadows of life are caused by standing in our own sunshine.: Ralph Waldo Emerson