Its all about wind. Dont matter how much you try to kill your sent, if the wind is wrong, you will get busted. Got to remember thermals. You can have deer right infront of you and under you with the wind at your back, if you have a thermal up draft, your scent is being carried over the deer, but it is still landing further down the line. You can not kill human odder, you can reduce it, but not to the point a deer can detect it.