One thing he brings up a good point in the ssnakess forum is that the manufacture could be held liable for there statements down the road. I myself will still carry it, because I know it works on insects but never tested with snakes. Though it's questionable if it is even effective on snake bites but I doubt anything more harmful will come out of it by trying. If it even takes out any venom, even >.1% then it's positive. On the web site it says:

http://www.sawyeronline.com/sawyer_products/pages/extractor/extractor2.htm

Using your thumb, push the plunger all the way in until you feel the suction, and let the remove poison. This should take from 60-90 seconds for insect bites. The first five minutes are most beneficial for applying the to a snake bite. However, suction may be left in place for several hours or until no longer possible due to swelling. Center a suction cup over one fang hole at a time. Alternate between fang holes every two minutes for the first twelve minutes, than at intervals such as 15 minutes.


http://www.ssnakess.com/forums/general-venomous-forum/63462-snake-bite-extraction.html

As the Food and Drug Administration moves to hold manufacturers of retail food and medical products to their advertising claims, those made by the manufacturers of extractors should not be exempt, but warrant scrutiny.
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Failure is not an option!
USMC Jungle Environmental Survival Training PI 1985