why do you guys use scent blocker/killer? I have used it once before and it seemed absolutely impossible with amount of scent the human body must produce. Your breath, head, feet, etc.... I was reading petersen hunting magazine and they talked about studies with police dogs, and german shepherds apparently have 100 less receptors than a deer and how the dog in this study found hunters just as easily with or without scent killers and how it is impossible to cover scent with these products. So is this just a mental thing for people?