Wow James, that aspect never got brought up at all.

Someone has his thinking cap on

I can imagine that a snake would find anything lodged under it's skin to be annoying, possibly even to the point of rubbing the spot against things to try and get rid of the new "parasite"

Venomoid Inc. Uses tattooing on the roof of the mouth to prove de-venomation, According to their web site.

But then again, if your Viper or Cobra was found, I honestly think it would be a "Shoot first, ask later" situation anyways.