If it's being used by criminals, print more of it and put a visible transponder in each note.
Anyone caught with $100 notes when walking through a random scanner can then be scrutinised as 'they fit the profile'
Well these days if the police find more than a few hundred dollars cash on you..... you are apparently up to something nefarious.
Hard to believe that the banks are that desperate to have all the money in their systems.
