Edit: I forgot about Ciraolo, which is another case where police, without a warrant, intentionally flew over a backyard that was enclosed by a fence. In that c

Edit: I forgot about Ciraolo, which is another case where police, without a warrant, intentionally flew over a backyard that was enclosed by a fence. In that case, the police found marijuana plants growing. The court upheld the conviction of the homeowner despite the lack of a warrant. Again, right or wrong, it's pretty settled that the police can use visual observation without a warrant, even if you fence in your yard. https://en.wikipedia.org/wiki/California_v._Ciraolo https://en.wikipedia.org/wiki/California_v._Ciraolo