Concrete Fencing Does Concrete Block Fencing Keep Snakes Out?

Does concrete block fencing keep snakes out? - concrete fencing

I think back to live in Arizona, but I'm happy about rattlesnakes, scorpions and many other things worry. T-we live in Arizona with a concrete wall? Have you ever seen a snake or anything else that is poisonous in the garden. I am worried about my children playing in the yard.