The objective of the second phase of the study was to analytically evaluate the newly developed Mixed Odor Delivery Device (MODD) and compare the device to the Merger, a previously designed apparatus for the delivery of explosive odorants to canines. Additionally, the odor profiles of homemade explosive (HME) materials, mixed and unmixed, were evaluated as a means for experimentally validating the use of the Merger or MODD. The design of the MODD was also assessed with trained detector canines. Results of these preliminary canine trials informed the final design of the device. Additional laboratory testing confirmed the efficacy of these design modifications. Finally, a formal set of canine trials substantiated the previous canine trials and analytical evaluations