“The Supreme Court indicated that a police officer’s right to walk up to a front door of a person’s home is subject to an implied license based on existing social norms. Going on to the property and approaching the front door is a physical intrusion onto the curtilage, Jardines holds. But there is an implied license to approach a front door with the intent to knock and try to speak to the homeowner. Jardines holds that the implied license does not extend to bringing a dog to the front porch of a house with the intent to search the home. One question that arises from Jardines is whether the police can go up the front door when a homeowner puts up ‘no trespassing’ signs or something similar.”
http://www.volokh.com/2013/09/03/can-police-enter-property-marked-trespassing-signs-take-two/
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