Assuming you mean the cash itself, tracing dollars isn't common with other kinds of small-scale illegal transactions like drugs and firearm sales. Why do you b

Assuming you mean the cash itself, tracing dollars isn't common with other kinds of small-scale illegal transactions like drugs and firearm sales. Why do you believe it would suddenly make peer2peer cash to cryptocurrency exchanges unviable? And if you meant tracing the Monero itself, I suggest you read up on how Monero works—and how it differs from BTC—first.