When limestone gets even more squashed, it can turn into travertine or marble. Limestone is also the main way you get lime, which is one of the things you make cement out of. To get lime, you have to burn limestone in lime kilns, and then what is left is lime. In the Middle Ages, people burned most of the statues of ancient Greece and Rome to turn them into lime.
Far as I am aware, CBD oil is not legal in Texas. It is legal for medical use in only Utah, Alabama, Kentucky, Wisconsin, Mississippi, Tennessee, North and South Carolina, Iowa, Florida, Georgia, New York, and Missouri.
The main point that Cannabidiol is always CBD, but CBD oil from hemp is not the same as the oil that is extracted from medical marijuana, which can contain any varying amount of THC. Therefore this type of CBD oil is listed a Schedule I drug and not legal in many states in the US and countries worldwide.