Does absolute immunity apply to a police witness at a non-trial proceeding?

In this circuit's leading post-Briscoe decision, Holt v. Castaneda, 832 F.2d 123, 127 (9th Cir.1987), cert. denied, --- U.S. ----, 108 S.Ct. 1275, 99 L.Ed.2d 486 (1988), we extended the Briscoe analysis to provide absolute immunity for a police witness at adversarial pretrial proceedings. We reviewed the decisions of other circuits in which absolute witness immunity has been extended to various nontrial proceedings, see Holt at 125-26, and concluded that there was no meaningful distinction between the considerations underlying Briscoe and the considerations that would support absolute immunity for witnesses in adversarial pretrial proceedings.