Newly available data suggests that overdoses in Missouri prisons are on the rise — despite a tough new policy for inmate mail designed to keep drugs out. On July 1, the Missouri Department of Corrections barred inmate from receiving physical personal mail, a move designed to curb the flow of drugs into their facilities. For the past three and a half months, inmate mail has been routed through a digital mail center in Florida, where all personal mail, photos and drawings are scanned.