St Andrew’s rule on threatening prostitutes

St Andrew’s rule on threatening prostitutes is Andrew Dalziel’s informal policing maxim: a threat is most effective when it bears on the immediate pressures of a person’s life. Its short horizon makes it useful as an interrogation tactic, and the encounter with Big Maggie shows it producing information where a remote court date would not.

Principle and rationale

Dalziel’s rule rests on a practical distinction between immediate and deferred consequences. A court appearance the following month carries little force for people who live from day to day; the possible loss of tonight’s earnings, or trouble with a pimp, matters now. The maxim therefore directs the officer to make the threatened consequence near-term and concrete rather than rely on a distant legal process.

The book labels this approach the Gospel according to St Andrew, presenting it as Dalziel’s own working doctrine rather than a formal procedure. Its bluntness is part of its method: pressure is calibrated to what the person being questioned is likely to fear in the immediate moment.

Use with Big Maggie

Dalziel applies the principle while questioning Big Maggie about Dolores. After she denies knowing Dolores, he threatens to take her to the station and suggests that the station is busy enough to delay her processing until the next day. The threatened inconvenience is immediate, fitting the rule’s emphasis on present-day costs.

Big Maggie then says she saw someone on Thursday night. The exchange thus gives the maxim a direct practical consequence: the threat elicits a new lead after her initial denial. The passage does not establish who she saw or what the sighting ultimately proves, so the rule’s demonstrated result is the disclosure itself, not a solved question.

Place in Dalziel’s policing

The rule belongs to a broader pattern in Dalziel’s treatment of police work: he favors immediate, usable distinctions over extended inquiry into matters he considers outside the investigation. In discussing the Maciver death with Peter Pascoe, he treats the decisive question as whether the suicide was unassisted; if it was, he says, there was no crime and no need for an investigation. Peter Pascoe objects that suicide is never simple, but Dalziel maintains that its causes are not the police’s concern.

That exchange is not an instance of the prostitution rule, but it clarifies the practical outlook behind it. Dalziel reduces a complicated situation to the question he thinks can be acted on, whether by defining the limits of an inquiry or by choosing a threat likely to work. The rule’s force—and its coercive character—lies in how directly it turns that outlook into pressure on a person being questioned.