Informants play central but problematic roles in drug investigations, often providing probable cause for searches and testimony at trial while operating under powerful incentives to produce cases. Defense attorneys must expose the transactional nature of informant relationships while revealing unreliability inherent in purchased testimony. These witnesses often determine case outcomes despite serious credibility issues.
Substantial assistance motivations create powerful incentives for fabrication. Defense attorneys document pending charges, sentence reductions, and monetary payments informants receive. They calculate total benefits often reaching tens of thousands in dismissed charges and cash. Juries learning about substantial compensation naturally question whether testimony is truthful or purchased.
Reliability challenges examine informants’ criminal histories and pattern behavior. Defense attorneys investigate prior cases where informants testified, looking for inconsistencies and failed prosecutions. They document histories of deception, failed polygraphs, and recanted testimony. Career informants working multiple agencies simultaneously lack credibility.
Corroboration requirements expose absence of supporting evidence beyond informant claims. Defense attorneys emphasize missing recordings of crucial conversations, lack of documented transactions, and absence of independent witnesses. They highlight investigator failures to verify informant information independently. Uncorroborated informant testimony creates reasonable doubt.
Disclosure obligations under Brady and Giglio require revealing informant deals and credibility issues. Defense attorneys file comprehensive discovery motions seeking all benefits, prior testimony, and deactivation reasons. They investigate undisclosed promises and side agreements. Prosecution failures to disclose can result in reversals.
Cross-examination strategies systematically destroy informant credibility. Defense attorneys confront informants with benefit calculations, prior inconsistent statements, and criminal histories. They expose coaching sessions and rehearsed testimony. Effective cross-examination transforms seemingly damaging witnesses into reasonable doubt generators, revealing the unreliable foundation of many drug prosecutions.