One of the main reasons policymakers cite for establishing a standalone, independent anticorruption agency is the need to strengthen the enforcement of their nation’s laws against bribery, conflict of interest, and other corruption crimes. In the past 25 year some 150 countries have created a specialized, independent agency to fight corruption (De Jaegere 2011), and virtually all have been given the lead responsibility for investigating criminal violations of the anticorruption laws. But while a broad international consensus exists on the value of creating a new agency with investigative powers, opinion remains sharply divided on whether these agencies should also have the power to prosecute the crimes it uncovers. As this is written, Indonesian lawmakers are considering legislation to strip its Corruption Eradication Commission (KPK) of the power to prosecute while a bill before the Kenyan parliament would grant its Ethics and Anticorruption Commission (EACC) the power to prosecute the cases it investigates.
No matter the country, debate about whether a single agency should have the power to both investigate and prosecute corruption cases inevitably comes down to a small set of conflicting claims. Those who oppose giving a single agency both powers raise an argument at the center of the older debate about the relative responsibilities of police and prosecutors — investigator bias. In the words of a British Royal Commission that studied the relationship between English police and prosecutors, an investigator “without any improper motive . . . may be inclined to shut his mind to other evidence telling against the guilt of the suspect or to overestimate the strength of the evidence he has assembled.” That is, once an investigator hones in on a suspect, confirmation bias sets in, and he or she will interpret all evidence as supporting the suspect’s guilt. Putting the decision about whether to prosecute a case in an agency wholly separate from the one that investigates provides a strong check against such bias, reducing the chances that the innocent will be put to a trial or weak cases brought to court.
The investigator bias argument has a long and distinguished pedigree, and a 2011 survey of the powers of 50 anticorruption agencies by World Bank economist Francesca Recanatini found that it often carries the day. Only half of the 50 agencies she surveyed have both investigative and prosecutions powers. But as the contemporary debates in Indonesia and Kenya suggest, proponents of combing investigation and prosecution in a single agency have a very powerful counter argument in their corner. Continue reading →