(AP) — A new report released Tuesday shows that a nationwide push by prosecutors to re-examine possible wrongful convictions contributed to a record number of exonerations in 2013.

The National Registry of Exonerations says 87 people falsely convicted of crimes were exonerated last year. The joint effort by the Northwestern University and University of Michigan law schools shows that nearly 40 percent of those exonerations were initiated either by law enforcement or included police and prosecutors’ cooperation.

Texas topped the state-by-state breakdown with 13 exonerations in 2013, followed by Illinois, New York, Washington and California.

District attorneys in the counties containing Dallas, Chicago, Brooklyn, Manhattan and Santa Clara, California, are among those with new “conviction integrity” units. The International Association of Chiefs of Police also is pushing to reduce wrongful convictions.