Which of the following would constitute a "search" subject to the requirements of the 4th Amendment?
1) The local police department's use of a helicopter to fly over a suspect's house and to see into the backyard area immediately outside his house.
2) A detective's search of a suspect's closed garbage bags placed out for collection.
3) A police officer's attaching a GPS device to a suspect's care to track the suspect's car while it travels on public roadways.
4) A nosey neighbor climbing over the fence of a suspect's home, on his own initiative, in order to see what was in the suspect's yard.
