What is the test for a plaintiff to bring a civil action against a federal government official who allegedly deprived him of a federal constitutional right?

If plaintiff chooses to amend the complaint, plaintiff must demonstrate how the conditions about which he complains resulted in a deprivation of plaintiff's constitutional rights. See, e.g., West v. Atkins, 487 U.S. 42, 48 (1988). Also, any amended complaint must identify as a defendant only persons who personally participated in a substantial way in depriving him of a federal constitutional right. Johnson v. Duffy, 588 F.2d 740, 743 (9th Cir. 1978) (a person subjects another to the deprivation of a constitutional right if he does an act, participates in another's act or omits to perform an act he is legally required to do that causes the alleged deprivation).

Plaintiff may not sue any official on the theory that the official is liable for the unconstitutional conduct of his or her subordinates. Ashcroft v. Iqbal, 556 U.S. 662, 679 (2009). He must identify the particular person or persons who violated his rights. He must also plead facts showing how that particular person was involved in the alleged violation.