to conduct the large clinical trials that are needed. nkts now there's a whole new wave of cbd research that is being funded. >> the stanley brothers are among them. while proof that cannabis works isn't yet required for cbd to be sold in stores or online, they want the data regardless. >> we live in a world, in a system that needs scientific validation and a prosets before you can make any claims. so we have to go responsibly about it. >> we have to be responsible because if you get it wrong, people like jay get sick and nearly die. responsibly because, remember, a little girl, charlotte, her life depends on it. that when we come back. anyone can deliver pizza. only marco's can deliver america's most loved pizza. hot and fresh, and right to your door.