To keep or not to keep, a milk snake I found in my backyard.

[*Don't Mind Me*]

Seems like every snake caught in the wild, and kept, eventually dies from stess, or refusing to eat, or escapes when the chance is there. Plus, wild caught reptiles can carry diseases and parasitic worms and mites. I would put it back where it was found, away from the road.
Nothing wrong with keeping it for a few hours just to look at it though