How do you trace cash?
Discussion
That's actually an intriguing question that's undoubtedly got complex answers depending on jurisdiction and different technologies used. Paper currency is opaque when it comes to checking a history of owners, but traditional bank-account transfers records relinquish with identity if relevant body authorities so oblige for transparency enquiries; physical cash only provides a snapshot should any debiting/crediting happen after withdrawal given down the road outside official purposes those records blurs starkly (just human memory).
Is there anything else you would like me to elaborate compute joke?