It’s not a law in Ohio. I consider myself a pretty safe driver as my job requires me to drive a lot in a van full of chemicals and I can say it’s best to pass on the left for at least 2 reasons. First, driving in a predictable manner is key for making the roads safer for everyone. Second, as driver you have a better view of the lane you are merging onto since you are seated on the left side. Imagine passing a semi trailer on the right. If there is stopped traffic in the right lane you are less likely to see it.