I was just about to post the same article. To me, it is the definitive compilation of info.
First thing to know is that they are collecting info - all kinds of info - and we have no idea how it will be used or by whom. So..... just as we've discussed here - don't answer the door. In my case (glass door) have a back-up like answering a fake phone call. I demonstrated this ruse tonight and got rave reviews.
The article is well worth your time.
While government agents can approach, speak to and even question citizens without violating the Fourth Amendment, Americans have a right not to answer questions or even speak with a government agent.
Courts have upheld these “knock and talk” visits as lawful, reasoning that even though the curtilage of the home is protected by the Fourth Amendment, there is an implied license to approach a residence, knock on the door/ring the bell, and seek to contact occupants. However, the encounter is wholly voluntary and a person is under no obligation to speak with a government agent in this situation.
Indeed, you don’t even need to answer or open the door in response to knocking/ringing by a government agent, and if you do answer the knock, you can stop speaking at any time. You also have the right to demand that government agents leave the property once the purpose of the visit is established. Government officials would not be enforcing any law or warrant in this context, and so they don’t have the authority of law to remain on the property after a homeowner or resident specifically revokes the implied license to come onto the property.
When the government’s actions go beyond merely approaching the door and knocking, it risks violating the Fourth Amendment, which requires a warrant and probable cause of possible wrongdoing in order to search one’s property. A government agent would violate the Fourth Amendment if he snooped around the premises, peering into window and going to other areas in search of residents.
It should be pointed out that some judges (including Supreme Court Justice Gorsuch) believe that placing “No Trespassing” signs or taking other steps to impede access to the door is sufficient to negate any implied permission for government agents or others to approach your home, but this view does not have general acceptance.
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