Check your local laws and reliable sources by: Ivan
The use of wasp spray as a "defensive weapon" almost reaches urban legend status, mainly suggested by folks who haven't really done much research into the subject (and indeed even Snopes has an entry for this: http://www.snopes.com/crime/prevent/waspspray.asp)
I suggest that anyone contemplating using wasp spray in this manner first check the relevant laws of their locale, as well as do a little research into what the experts (legal and self defense) say on the matter.
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