Stoned on duty

"The Exploits of a New Zealand Undercover Cop." "Peter Williamson joined the police force as a young, idealistic rookie who saw his new job as the start of a bright future. [. . .] After Jude works undercover in an attempt to smash a schoolgirl sex ring, the couple are approached to joint the undercover program. [. . .] They learn how to roll joints, how to smoke them, the language and lifestyle of New Zealand drug peddlars [. . .] He feels lost in a world of double-dealing, as suspicious of the police as he is frightened of the dealers he is setting up for betrayal." - from dust-jacket blurb.