>>Also it's not a long term captive. It's a wild garter that Ive
>>been rehabilatating for a month.
"Long term captive" is a very subjective term. I consider a month to be long-term in regards to potential for acclimation to captive life (no predators, fed regularly, perfect temps, etc) and exposure to pathogens. Not knowing the circumstances under which you personally keep this snake, I make the blanket statement that it'd be better for the local garter population for you to keep this one.
I think I showed a winking sad face after my last post; it turned out to be some green hysterical icon!
I would also rather not place it back where it came from as the area has a lot of people,kids, and vehicles.(Suburban area)
That's the case where a LOT of snakes actually thrive. Your snake may end up contributing to the local gene pool if you put it back where you found it--I'm sure there are other snakes which thrive there or else you wouldn't have found the one you did!
I get lambasted on other forums for my translocation of snakes (rat snakes and diamondbacks--in association with my local herp club) even for distances under a mile. Some species apparently try to return to their point of capture, unfamiliar with the new area, and die of starvation in the process. I don't totally buy into that; I figure even if they are out there wandering aimlessly they may wind up as prey for another animal (roadrunner, coyote, hawk) and be better off than dumped in the garbage (we have a lot of the "the only good snake is a dead snake" types here).
Sorry I know that your
>>opinion is I should keep it. I feel that it would be wrong for me to make a long term "captive" out of a wild born snake that can live quite well on it's own,without any attachment from it's few months of captivity.
You could argue that it could've healed on its own with no human intervention as well. 
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Chris McMartin
www.mcmartinville.com
I'm Not a Herpetologist, but I Play One on the Internet