No, he's not poisonous. And yes there are differing head shapes that can help clue you in, although there are some non-venomous that can look pretty daunting too!Yeah, it was a real pretty looking snake. I noticed a molted skin the evening before, right by the steps outside the sun room. That's my route to/from their yard. It looked as if it had been going into the flower bed when it left it there. Same size as the snake last night, I assume it was that snake, but there are obviously a bunch out here. I find them in the pool skimmers all the time. It was only just over 3 ft or so. Definitely surprised me!I'm sure all my neighbors heard the string of F-bombs flying from my lips if they were outside. Question though: It is my understanding that venomous snakes have more of a pointy shaped head and that non-venomous have a more rounded sort of shape. Is that correct or just an old wive's tale. Once I got a good look at it's face, I chilled a bit. Didn't look like a threat.
Next time I will relocate, if anyone can advise how to actually catch them and where to let them go at. LOL He was a slippery thing. Too crafty for me.
See if this link works for you.. It's a great picture tutorial.

https://m.facebook.com/heidi.taylor.10/albums/1163470673671620/