Originally Posted by Walt34
It depends on state law. I think in most states unless the property is posted or the owner or a person in a supervisory position (at a business) tells the visitor to leave there is no trespass. That is, merely walking to the door and knocking is not a crime.
Both states I've lived in required signs or paints. We had undercover agents, sheriff and state police knock on the front door. They wanted to know about the house 1/4 mile west of ours. DW explained we couldn't see it, observed nothing. They asked if they could observe the house from our twenty acres. She said sure please stay on this side of our private road. They had no problem with that. Our house was private, we had no drapes.
About a month later there were 20 marked und unmarked LE cars out in their driveway. Probably some unmarked Federal guys as well.
These folks were smuggling modern "speedballs" (meth and PCP (horse tranquilizer)) from Mexico and distributing from an old dumpy house. Even with all the late night visitors they observed couldn't get a warrent. They had to get the warrant on child protection charges, but then saw some drugs.
I answer the door with caution. The religious folks I just smile and wish them a nice day.