Last week, Treasury secretary Dr Steven Kennedy gave a long speech outlining his department’s commitment to “evidence-informed policymaking”.

Loading

For many years, the medical profession has been committed to using “randomised controlled trials” to evaluate the effectiveness of medicines and medical procedures. These involve experiments where subjects are divided into two groups selected at random. One group is given the pill or the procedure, then compared with the “control” group to see what difference it made.

Now the econocrats want to use this technique to evaluate government spending. And on Tuesday Dr Andrew Leigh, the assistant minister for competition, charities and treasury, gave a speech on evidence-based policing.

Controlled experiments have been used to study the effectiveness of police behaviour in America for many years. For instance, it’s widely believed that the use of body cameras will improve the way police treat members of the public. But a study involving more than 2000 police officers in Washington DC found that wearing cameras had an insignificant effect on police use of force and on civilian complaints. Their benefit was in providing better evidence in court.

In Australia, the Queensland community engagement trial tested the effect of training in “procedural justice” on citizens’ views of the police. Traffic police were taught to use a script when speaking to drivers stopped for random breath testing. The study found it improved drivers’ views of the police, though they were no more likely to obey officers’ directions. (But I doubt if many people disobey the coppers, no matter how impolite they are.)

Loading

Many randomised trials involving the police are being conducted in Victoria. One seeks to reduce the number of people who fail to appear in court after being summonsed. It tests the effect of providing simpler information, replacing a 2200-word, seven-page document with a 60-word statement and links to support services from Victoria Legal Aid and the Victorian Aboriginal Legal Service.

The initial results show that the shorter document leads to better court attendance, and thus fewer arrests and incarcerations of people who don’t turn up. The results of many more experiments are on the way.

Meanwhile, the Brits have set up a What Works Centre for Crime Reduction, and Leigh hints that we may do something similar in Australia.

Policing is just one example, of course. It all seems pretty laborious, but if it leads to less ineffective spending and better government it’s a worthwhile endeavour. And not before time.

Ross Gittins is the economics editor.

Ross Gittins unpacks the economy in an exclusive subscriber-only newsletter. Sign up to receive it every Tuesday evening.