[adamanteus]

That was the first thing I looked for, Rick! Garters don't get a mention specifically, they're just lumped together with....

"..other colubrids having aglyphous dentition with no grooved fangs. In some a duct emerges from the Duvernoys gland onto the external face of the maxillary bone, opening near simple, solid and ungrooved teeth. This is not an effective venom apparatus, and any toxic secretions enter the preys' body as it is chewed during swallowing."

Personally, Rick, I can't see how Garters can ever be grouped amongst the Opistoglyphous snakes.