Sunshine as disinfectant: The effect of state Freedom of Information Act laws on public corruption

• FOIA laws increase the conviction rates for state and local officials.
• These officials respond by reducing their corruption rates.
• Prior studies have confounded these two effects.
• Effects stronger for laws which include individual liability for noncompliance.

We assess the effect of Freedom of Information Act (FOIA) laws on public corruption in the United States. Specifically, we investigate the impact of switching from a weak to a strong state-level FOIA law on corruption convictions of state and local government officials. The evidence suggests that strengthening FOIA laws has two offsetting effects: reducing corruption and increasing the probability that corrupt acts are detected. The conflation of these two effects led prior work to find little impact of FOIA on corruption. We find that conviction rates approximately double after the switch, which suggests an increase in detection probabilities. However, conviction rates decline from this new elevated level as the time since the switch from weak to strong FOIA increases. This decline is consistent with officials reducing the rate at which they commit corrupt acts by about 20%. These changes are more pronounced in states with more intense media coverage, for those that had more substantial changes in their FOIA laws, for FOIA laws which include strong liabilities for officials who contravene them, for local officials, and for more serious crimes. Conviction rates of federal officials, who are not subject to the policy, show no concomitant change.