Only a few species of snake in the United States have a stripe down the center of their back. Using a camera and field guide is a safe way to identify a species and determine if it is venemous or not.
Plains Gartersnake Missouri Department of Conservation
Orange-Striped Ribbonsnake Missouri Department of Conservation
How to Identify Red & Black Striped Snakes
Eastern Garter Snake
Snake Species of Ohio at a Glance
How to Identify Red & Black Striped Snakes
How to identify venomous snakes in NC / SC: Photos, markings
Black Snakes with Yellow Rings in Georgia
How to Identify Snakes by Stripes
Science Projects on Snakes
Striped Snakes in California
Aurora House Snake (Lamprophis aurora). Note the broken orange line that runs down the center of the back. A harmless constrictor.
Snakes That Have a Checkered Belly
Garter Snakes Can Be Surprise Guests - The White River Valley Herald