What is the slowest passenger screening method available?

The Custom Accelerated Passenger Processing Service (CAPIS) is considered the slowest passenger screening method available primarily due to its detailed and individualized approach. CAPIS focuses on thorough vetting and assessments of passengers, often involving additional scrutiny, which inherently increases the time taken for the screening process. This program is designed to ensure the highest level of safety by allowing for a more customized review of specific passengers, making it less efficient compared to the other methods listed.

In contrast, standard screening typically adheres to established protocols that can process a higher volume of passengers efficiently. Fast Track Screening and Pre-check Screening also aim to expedite the passenger screening process, allowing pre-approved travelers to go through with fewer interruptions, further demonstrating their efficiency compared to CAPIS.