Prison administrators and other prison personnel often assume that the absence of escapes is a sign that the security system is effective. Such complacency is an invitation to security breaches. Prison security systems must be constantly checked and upgraded when necessary so as to prevent the vulnerability and complacency that invites inmate escape attempts. Examples of poor security practices that have led to escapes include failure by officers to check ID cards, failure to perform strip searches properly, sleeping or exercising in towers or on perimeter posts, poor tool and key control, and failure to make security checks. Security systems checks are an essential part of a comprehensive security audit program. They are needed to identify deficiencies and assess readiness. Systems checks can range from something as simple as a shift supervisor engaging in the "what if" game with a post officer to something as complex as department-wide disaster simulations that involve a cross-section of staff rank and assignments. Between these extremes lies a myriad of systems check options to test security readiness at all operational levels. The results of systems checks should be documented and reviewed at staff meetings and shift briefings so the lessons learned can be shared by all.