What is the test for establishing a "clearly established" right to exercise privacy rights?

Reichle v. Howards , 566 U.S. 658, 665, 132 S.Ct. 2088, 182 L.Ed.2d 985 (2012). As a practical matter, therefore, we must identify a case substantially similar, or nearly identical in some contexts, to the one at hand to find "clearly established" what otherwise would seem to be clear constitutional rights.³