As the Department of Homeland Security (DHS) moves forward with the Chemical Facility Anti-Terrorism Standards (CFATS), the program continues to evolve. This white paper describes the ongoing CFATS compliance process (which is a combination of technical, procedural, and personnel security) and also provides insight regarding how the process has been adjusted to allow for an additional step, the Pre-Authorization Inspection (PAI). Recommendations are relevant to Site Security Plans (SSPs) for all tier levels and should also be considered for a facility's initial SSP submission.