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.
1 CBD found naturally in hemp is also legal in the United States (like all other hemp imports), while CBD from marijuana is federally illegal in the United States, though state-by-state legalization is occurring rapidly.  Cannabidiol can also be produced synthetically in a laboratory.