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Appendix A <br /> Appendix A <br /> FACS Data Collection Methods <br /> Particle Characterization: Samples may be collected using transparent adhesive tape or by <br /> vacuuming dust onto a filter(aka micro-vac). The surface dust samples are labeled with unique <br /> sample numbers and information recorded on field chain of custody forms. The samples are <br /> promptly delivered to the laboratory for analysis. In the laboratory, samples are analyzed by <br /> polarized light microscopy(PLM). The laboratory estimates the percentage of the visual area of <br /> the dust particulate composed of the various particulate types (a technique known as visual area <br /> estimation-VAE). <br /> www.forensicanalytical.com Forensic Analytical Consulting Services <br />