In United States v. Lockett, 782 F.3d 349 (7th Cir. 2015), Kristen successfully argued before the Seventh Circuit Court of Appeals that Mr. Lockett's prior convictions did not qualify under the Armed Career Criminal Act (ACCA) because the Government failed to provide any evidence that Mr. Lockett was subject to Illinois' recidivist enhancement. Mr. Lockett was originally sentenced to the mandatory fifteen-year minimum under the ACCA. In August 2015, he was released from prison for time served.