It's a bit of both. It's not too hard to get cash-only "customers" to buy services you don't have to actually perform. It's also pretty easy to write two invo

It's a bit of both. It's not too hard to get cash-only "customers" to buy services you don't have to actually perform. It's also pretty easy to write two invoices, feign a mixup, and skim some off the top of a payment.