What is the test for a "clearly established" standard in civil rights cases?

The operation of the "clearly established" standard "depends substantially upon the level of generality at which the relevant legal rule is to be identified." Anderson v. Creighton , 483 U.S. at 639, 107 S.Ct. 3034. "The contours of the right must be sufficiently clear that a reasonable official would understand that what he is doing violates that right." Id . at 640, 107 S.Ct. 3034. However,

Id . Thus,

Safford Unified School District No. 1 v. Redding , 557 U.S. 364, 377-78, 129 S.Ct. 2633, 174 L.Ed.2d 354 (2009) (other internal quotation marks omitted).

[859 F.3d 171]

C. First Amendment Principles