This paper presents a current overview of the Vapor/Particle Detection Program that is currently in place at the FAA Technical Center. The Purpose of the program is to develop the systems and technologies that can eventually be deployed in airports that can screen luggage and passengers for explosives. The paper will discuss how current program is structured in terms of long term research, new term development, support activities and cooperative efforts with other agencies. In addition some of the current vapor detection technologies will be discussed as an introduction to the areas that requires signal processing.