In what circumstances have the courts found that a police informant in a search warrant application was unreliable?

In KRL v. Moore, the plaintiffs in a 1983 action, like plaintiffs here, claimed a search warrant lacked probable cause. The plaintiffs challenged the reliability of the informant alleging that the officer's affidavit omitted: (1) the informant's criminal history, and grudge against plaintiffs, (2) lacked corroboration of informant's testimony, a prior complaint filed by the informant was investigated and found to be unsubstantiated. KLR, 384 F.3d at 1117-1118. The court held even taking the facts in light most favorable to plaintiffs, "the omission did not affect the finding of probable cause to support the

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