I highly recommend the Kimber Pepper Blaster!
Not only does Kimber make a mighty fine shootin' iron, but they also have an ingenious little contraption called the Pepper Blaster. Basically, it is a small handheld unit that has two charges of extremely potent OC spray. The cool thing about the Pepper Blaster is that the liquid charges are propelled, not by compressed air, but by a pyrotechnic charge (just like a bullet). This results in a big splash of OC spray hitting your face at about 90 miles an hour. Much harder to avoid than the standard canned sprays, less affected by wind, and even wraps around glasses and gets into the eyes.
My old department was looking into the big brother of this unit for less lethal use (the JPX Jet Protector), but then we ended up moving to tazers. If I had to carry an OC, I would carry the pepper blaster. See here:
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Be advised that I am NOT a fan of OC. In fact, since you are in TN, I would suggest a tazer instead.