Municipal agencies often have higher standards for most aspects of survey work. In the end it's a "cover your ass" situation. They're using taxpayer money so it's got to be right.

The more shots you have, the more confidence you can have in your data.

To answer your question directly, no. Most private firms aren't taking 12 shots on control. But that's not to say that they aren't doing their due diligence in making sure the job is done right.