I think a lot of these contractors are going to ‘reach out’ and pull back a stump.
When they come to your door, tell them that before you let them into your house, you need to verify their identities. Then immediately pull out a digital recorder.
Ask for whatever “official identification” they might have — copy down name, and company name and address.
Ask them for their company location, phone number, and name of their supervisor. If you have a smart phone, use google to see of the phone number is listed. Call the company and ask for the visitors by name, and then ask to speak with the supervisor. You can ask the supervisor why they sent the visitors out to see you.
Then ask to see their driver’s license with their address — after all, they have yours. I predict 99% of these yahoos will then discover that they need to be elsewhere. Note that at no point have you made a “threat” against them.
If deputies show up later, you can always claim that you are just being “careful”. If they persist, then bring out a second digital recorder, and start the same procedure with them — identity, what complaint they are investigating, who made the complaint, probable cause, warrant, ...
FR thread: The Public Servant Questionaire (For Your Protection!)