The Supreme Court has considered three major cases in the past few years involving undercover "scenario" operations conducted by New Zealand police. The decisions raised significant questions regarding the legality and propriety of these covert investigations, and examined those matters in the context of applications to exclude evidence or stay criminal prosecutions generated by the use of such techniques. More specifically, the appeals engaged the Court in the explication and application of various provisions of the Evidence Act 2006, the New Zealand Bill of Rights Act 1990 and/or common law abuse of process doctrine. This article analyses, compares and critiques the judgments in Wilson v R [2015] NZSC 189, [2016] 1 NZLR 705, R v Kumar [2015] NZSC 124, [2016] 1 NZLR 204 and R v Wichman [2015] NZSC 198, [2016] 1 NZLR 753. The discussion deals with various law, policy and fairness issues raised by the three cases — which are scrutinised both individually and collectively. It concludes with recommendations for the future legal control of police scenario operations in New Zealand, including suggestions for oversight based principally on legislative reform.