Ya know, SciFi channel used to air horror movies about snakes that big.
Now the Science channel is airing DOCUMENTARIES about 'em...
By the way:
1> that's not a pic of a WESTERN DIAMONDBACK, the colors are all wrong and the pattern is more distinct than you'd find in that species (looks like a EASTERN DIAMONDBACK, to me); which leads me to
2> there is no St. John's county in Arizona.