I suspect the underlying concern is that the contractor is using undocumented workers and/or avoiding payroll taxes by paying workers in cash. That's why there was a huge push awhile back to file SARS on contractors who paid their workers in cash.
In the serious scheme of things, if law enforcement was really that concerned about who contractors are paying for work, they would have a sting operation at every Home Improvement store - any given morning you will see a lot of guys hanging around the parking lot waiting to jump onto a truck for a day job.
IMHO - SARs should really help law enforcement focus on more serious matters - child trafficking, financial crimes, actual drug money laundering, terrorist activity...., crimes where there are actual victims.
[stepping off soap box - continue your day]
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CRCM,CAMS
Regulations are a poor substitute for ethics.
Just sayin'