What is the test for a prison officer to prevent a riot?

"(T)he possibility of widespread violence is a continuous condition of prison life. A good faith determination that immediate action is necessary to forestall a riot outweighs the interest in accurate determination of individual culpability before taking precautionary steps. Indeed, even in many of the minor decisions that guards must make as problems suddenly confront them in their daily routines, the state's interest in maintaining disciplined order outweighs the individual's interest in perfect justice." United States ex rel. Miller v. Twomey, 479 F.2d 701, 717 (7th Cir. 1973), cert. denied, 414 U.S. 1146, 94 S.Ct. 900, 39 L.Ed.2d 102 (1974).