Diffusion (of scent):  the even distribution of air in all directions.

">Diffusion
  (of scent):  the even distribution of air in all directions.

Double Blind: A training exercise is considered Double Blind if the person person searching does not know the location of odor(s), and/or if any are prescent, AND the accompanying Instructor/Evaluator also does not know. 

">Double Blind
 : A training exercise is considered Double Blind: A training exercise is considered Double Blind if the person person searching does not know the location of odor(s), and/or if any are prescent, AND the accompanying Instructor/Evaluator also does not know. 

">Double Blind
 if the person person searching does not know the location of odor(s), and/or if any are prescent, AND the accompanying Instructor/Evaluator also does not know. 

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VSRDA Glossary