body: Recently i passed by a large local mosque. The mosque property was posted "No Gun Zone" at the property boundaries.
  
  
  If a resident posted such signs on their property then missionaries, delivery people, etc could continue to come and knock on their door as has been common for ages.
  
  
  Police offixers executing warrants would obviously not need heed the signs. Similarly if police are responding to exigent circumstances. 
  
  
  What if there is no warrant or exigent circumstances and police are doing a "knock and talk". Logically they could disarm before entering the property and do a compliant knock and talk. But i doubt they would be willing to disarm.
  
  
  My question is can a homeowner modify the implied lixense to come to the door to knock? If the modified license does not allow guns, is an armed police officers entry a trespass?
  
  
  If an armed police officer came to the door and claimed to see, hear, smell contraband not detectable off property is that admissible?
  
  
  
title: No gun zone and knock and talk