The proposed goal of Nevada Nanotech Systems Inc for the Phase II program is to adapt a commercially available gas chromatograph-mass spectrometer instrument for the problem of detecting U.S. currency via unique vapor signature in confined spaces and then field test three prototype units, operated by government personnel, during a 6-month field test. After this test, we will provide detailed documentation of the performance. The anticipated results for Phase II are: 1)Fabrication of at least three prototype systems for full evaluation. 2)Development and implementation of adapted sample collection, data analysis and user interface hardware and software. 3)Initial field-simulation evaluation of the prototypes in a laboratory setting. 4)The enabling and support of a 1-week initial field trial at a border checkpoint with government personnel operating the system. 5) Modification, as necessary, of the prototype systems based on performance data and information gathered during the 1-week initial trial. 6)The enabling and support of a 6-month evaluation of these systems in the field with government personnel operating the system. 7) Completion of a comprehensive assessment of the system's performance, including changes to the Con-Ops, instrument performance (capabilities and shortfalls), recommended changes to the instrument, and recommendations for the revalidation/ qualifications testing if changes are required.