More than 20 years ago Gary Marx broke ground with his foray into the sociology of undercover policing. His view was, and still is, that these policing tactics are essentially a necessary evil, but that they are a double-edged sword and that it is conceivable that such methods can, in principle, be regulated and controlled in order that the worst excesses and least desirable (unintended) outcomes are avoided. In his review of the original book, the European criminologist Cyrille Fijnaut basically agreed, but he also signaled his awareness of the corrupting potentiality of police undercover practices and of the need to bring them under the cover of law and legality. Covert policing tactics raise troubling questions that are with us still. Roger Billingsley’s slim edited collection is a recent addition to this literature and, although under theorized and largely descriptive, it will be a useful resource to academic criminologists and other scholars who are interested to explore and understand the latest developments. Whilst mainly focused on the contemporary situation in the United Kingdom, the contributions in the book (mostly penned by former or currently serving police officers or lawyers) offer many useful insights into one crucial tactic in the broad array of covert policing practices: the use of clandestine informers. The book is divided into three sections. The first deals with legal issues: the perspective of defense lawyers, the administrative regulation of covert human intelligence sources (CHIS), the use of promises of immunity in informant handling, Crime Law Soc Change (2010) 53:205–206 DOI 10.1007/s10611-009-9218-9
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