Field notes on deer and scent

Does scent control work?

Scent control can cut how much of you gets out. The wind decides where what's left goes. Here's what's been tested on carbon clothing, sprays and ozone, what hasn't, and what cutting your scent actually does to the cone.

By Gavan. 26 October 2026, a 6-minute read.

Carbon clothing

• In the lab, it blocks most of a test odour. In permeation tests on the record of a long court case, carbon garments blocked 96 to 99% of the odour compounds tested, against 5 to 55% for ordinary clothes. Experts on both sides agreed it can't stop all of it, and that a used suit can't be dried back to new (Buetow 2011; Buetow 2010).
• Against a dog, little difference. In the one peer-reviewed test, 42 trials with search dogs, carbon suits had "little effect" on how well the dogs found hidden people. A shifting wind slowed the dogs more (Shivik 2002).
• Against deer, mixed. The only deer test we found used a whole routine: carbon layers, scent-free soap and detergent, and spray. Trail cameras set up that way caught more deer at one North Carolina site, 5.2 against 3.4 a check, and made no difference at a second, busier site (Muñoz 2014).

The court case ended without ruling on whether the clothing works. The appeals court doubted "there are many hunters so scientifically unsophisticated as to believe that any product can 'eliminate' every molecule of human odor" (Buetow 2011). Clearly, the judges haven’t walked down the hunting retail aisle in October.

Sprays and soaps

The spray study the hunting press quotes is a 2014 talk from Mississippi State. Sixty-five people wore T-shirts for four hours, treated or not, and four commercial sprays "greatly" cut 29 body-odour compounds. A company paid for it, no percentages were released, and no deer were tested (ACS 2014). We found no published paper from it.

Ozone

We found no peer-reviewed test of ozone units with deer or dogs, and Outdoor Life's editors found none either (Robinson, Outdoor Life). What is known about ozone and people:

• The EPA, on ozone generators sold as air cleaners: at levels within health standards ozone has "little potential" to remove contaminants indoors, and "body odor may be masked by the smell of ozone but is not removed by ozone" (EPA).
• Ozone reacts with skin oils and makes new odour compounds (Wisthaler and Weschler 2010). In a test chamber it doubled what seated people gave off (Wang 2022). So instead of smelling like a person, you now smell like a person who tried to bleach a thunderstorm. Whether deer read that new mix as human hasn't been tested.
• Hunter tests. Field & Stream ran police dogs against a hidden hunter in plywood boxes, one run each. The dogs found him every time: in carbon clothing with spray, under cover scents, and with an ozone unit running inside the box, which slowed it from 14 seconds to 50 (Bestul, Field & Stream).

Half the stink, 70% of the cone

Say a product works as well as the lab says. What does that do to where you can be smelled? Scent thins as it spreads, roughly with the square of the distance, so how far it carries goes with the square root of how much you put out. Worked on the standard spread curves (Briggs 1973; Turner 1994):

• Half the scent: the cone is about 70% as long.
• A quarter of the scent: about half as long.
• A tenth of the scent: about 30% as long.

That holds on a sunny afternoon, an overcast day and a still night alike (our sums). And in every case the cone points the same way. You can wash in scent-free detergent, bake your jacket in ozone, and dress in activated carbon. Then you exhale. Turns out, breathing is heavily scented. A product can make the cone shorter. Only the wind decides where it goes.

The suit stops 96 to 99% of odour passing through the cloth. Your face didn't come in the box. Your breath, your hands, and the sweat from the walk in go out around it anyway.