This is mixing up "cash". Cash is produced by your country's mint (a public body), and comprises around 3-5% of available on-demand "money".

Private banks produce electronic debt which is fungible with "cash". This is available "on demand" as cash but only if you wish to withdraw less than the 5% which has a physical representation. The rest is available on demand to transfer as electronic banker-debt/credit into another part of the banking system.

The vast majority of the private bank debt is issued via lending against land.

I don't take issue with the use of cash in the drug trade, I'm unconvinced removing cash would see this fixed, most likely barter would take place instead.

I just wished to take issue with the fast and loose "cash is public".