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Monday, July 15, 2019 9:32:15 PM
To date, oral fluid is the most studied and promising alternative matrix for DUID programs. However, THC is detected in oral fluid for 48 hours in chronic smokers during sustained abstinence.
"Exhaled breath may offer an alternative to oral fluid testing as cannabinoid detection in this matrix may better coincide with impairment."
- Marilyn Huestis PhD
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4537523/#!po=0.704225
One must first understand pulmonary anatomy to better understand the exchange of compounds between blood and breath.
Within the lungs, your bronchi branch into thousands of smaller, thinner tubes called bronchioles. These tubes end in bunches of tiny round air sacs called alveoli (al-VEE-uhl-eye).
Each of these air sacs is covered in a mesh of tiny blood vessels called capillaries. The capillaries connect to a network of arteries and veins that move blood through your body.
The pulmonary artery and its branches deliver blood rich in carbon dioxide (including VOC'S ) to the capillaries that surround the air sacs. Inside the air sacs, carbon dioxide (including any VOC'S) move from the blood into the air. At the same time, oxygen moves from the air into the blood in the capillaries.
The oxygen-rich blood then travels to the heart through the pulmonary vein and its branches. The heart pumps the oxygen-rich blood out to the body.
Hope this helps...
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