Cra
I personally know of one escort who was audited.....they conducted a "lifestyle" audit to estimate/derive her annual income.....looked at things like rent, vacations, vehicles, credit card statements, bank statements, etc.....in the end she owned tens of thousands of dollars in taxes and penalties.
It would be hard to audit agencies per se, since I doubt any are incorporated and therefore would be run as sole proprietorships.....in which case the CRA may or may not identify the agency depending on how/if the owner declared the income on their personal T1.
Smart girls will declare some form of income so as to estabish earnings, credit possibilities, etc. The trick is not to declare very little income but then have tons of cash transactions running through your bank account, or lots of high end purchases appearing on your credit card statements......only put cash in the bank to cover regular expenses, etc and what you want to see declared as income....the rest...keep as cash and spend the cash.....do not use a credit card and pay it off with cash later.