They've been long thought not to have venom, but it turns out that they have a mild venom. But they don't inject it from their teeth. There's glands in the front of their mouth that release the toxin, while they grind their mouths onto the prey.
They are still considered harmless to humans, as the most that has happened is similar to a mild allergic reaction.
Here's some references, and there's more online if you google search garter snake venom. Keep in mind that many of it is old news, before any venom has been found. Look for the newer articles.
www.anapsid.org target="_blank" class="qa" rel="external">www.nytimes.com
They are still considered harmless to humans, as the most that has happened is similar to a mild allergic reaction.
Here's some references, and there's more online if you google search garter snake venom. Keep in mind that many of it is old news, before any venom has been found. Look for the newer articles.
www.anapsid.org target="_blank" class="qa" rel="external">www.nytimes.com