Mixed Odor Delivery Device (MODD)

An apparatus for training canines to detect complex hazardous substances from an odor mixture developed from at least two separated material components, the apparatus comprising:

• a chamber base unit having at least two vial wells configured to hold the separated material components;
• a chamber top unit having a first side facing the chamber base and a second side opposite the first side;
• the first side of the chamber top unit and the chamber base unit defining a primary vapor mixing chamber in fluid communication with the vial wells;
• the chamber top having a passageway extending from the primary vapor mixing chamber to the second side of the chamber top and allowing vapors to diffuse from the vial wells to the second side of the chamber top;
• a tube configured to be positioned within the passageway with a first end extending into the primary vapor mixing chamber;
• and
• a flow restrictor having a first end with a diameter configured to fit within the passageway, and having a cap with a wider diameter at a second opposite end that extends radially outward past the circular upper edge of the passageway.