In California v. Ciraolo, 476 U.S. 207, 213, 106 S. Ct. 1809, 90 L. Ed. 2d 210 (1986), the United States Supreme Court held that observation of marijuana plants in the respondent's backyard by trained officers in an airplane at an altitude of 1000 feet did not violate the fourth amendment to the United States constitution. Three years later, that court held valid an aerial search of the contents of a greenhouse within the curtilage of the defendant's home by a helicopter flying at an altitude of 400 feet in compliance with regulations of the Federal Aviation Administration (FAA). Florida v. Riley, 488 U.S. 445, 450, 109 S. Ct. 693, 102 L. Ed. 2d 835 (1989).