Much has been written about the inherent riskiness of cash. It is dangerous because it can be lost, stolen, eaten, destroyed, etc. It is dangerous because it is difficult to track, thereby helping to facilitate crime. Many a potboiler plot hinges on a cache of unmarked bills. Anyone remember Trixie Belden? “‘That governess of yours won’t argue when I tell her to leave a fat roll of unmarked bills under a stone at the Autoville entrance tonight.