What is the test for a plaintiff to bring a claim under Section 1983 of the Fourth Amendment for search and seizure of personal information?

Plaintiffs bring several claims for violations of their constitutional rights pursuant to 42 U.S.C. 1983. "To establish a prima facie case under 1983, [a plaintiff] must establish that: (1) the conduct complained of was committed by a person acting under color of state law; and (2) the conduct violated a right secured by the Constitution and laws of the United States." Humphries v. County of Los Angeles, 554 F.3d 1170, 1184 (9th Cir. 2009).

1. Fourth Amendment Search and Seizure Claims