Permethrin is used in flea sprays for pets, as well as things such as body mite cream which many of you may remember having to rub your naked bodies with in elementary or highschool during a lice outbreak. Perfectly legal in Canada.
The pet spray stuff you are supposed to douse it all over the carpet and furniture.
Heck, i had bedbugs in a nasty apartment and I found the strongest stuff I could find and doused the bed and whole room in it.
So after literally bathing in the stuff for weeks, I grew a 6th toe, webbed hands, gills and found an interesting side effect in my newfound Xray vision.
But it killed those bugs dead. And if you've ever turned a mattress and seen thousands of them scurrying away, realizing they've been eating you for months, you would want them dead too, regardless of the fantastic superpowers permethrin gives you. Therefore in places like Africa where the bugs are carnivorous and love white meat, I would not hesitate to use a permethrin tent either, unless you like malaria and horrible festering pustule wounds from strange and exotic insects the size of rats.
That is all.