With new cybercrimes reported in mainstream news media, have you been asked how to further strengthen your enterprise's security posture? Have you ever been asked about code scanning on z/OS? The IBM z/OS Authorized Code Scanner (zACS) is a new innovation in the area of system integrity. Pervasive encryption on IBM Z, IBM RACF for z/OS, and IBM Z Multi-Factor Authentication are just a few examples of differentiating enterprise security function available on the IBM Z platform, and they all rely upon system integrity. Authorized programs on z/OS and their associated application programming interfaces are critical to that integrity. These include authorized programs from IBM, the z/OS vendor ecosystem, and in-house code specific to a customer's enterprise. zACS was developed to support customers in their efforts to strengthen the security posture of the overall z/OS stack. This session will explain how the scanner is configured, how it is run, and what kinds of potential vulnerabilities it can discover for subsequent investigation as needed.