Yet again, at the advice of James, I'm starting a controversial thread. XD
For the discussion and debate of thiaminase and all other topics concerning it, I have this story as my side of the debate. Remember, we're all trying to discover the best diet for our snakes, and I don't think any one here is purposely going to try and kill their garter. *Otherwise you wouldn't be here. :P*

At the local wildlife area, there are two varieties of garters: The ones that live in the gardening plots and the surrounding forests, and those that live in the meadow by the lake and around it and rose garden pond. The "land" variety appears to have a diet consisting only of earthworms, slugs *especially the introduced leopard slug*, the occasional toad *Very rare* and mice, while the "water" variety eats only fish and frogs, with the fish being the majority of the diet. The problem with this is that the pond and lake are severely overrun with goldfish from irresponsible pet owners, and the local species are limited to the southern, rocky shore of the lake. The garters are found thoroughly through the western side where goldfish are most plentiful due to a seasonal creek and a large, algae-infested wetlands area. Somehow, the snakes manage to reach HUGE sizes on a limited diet of goldfish and baby green frogs. I may be jumping to conclusions, but wouldn't these snakes succumb to thiaminase poisoning if there wasn't something in their quadrupedal prey that helped buffer the toxicity?