By Meg Wingerter Dig Reporter mwingerter@oklahoman.comOklahoma City — Oklahomans responded with an outcry when the state Department of Health proposed limiting THC in medical marijuana, but there's little clear evidence on whether a cap would hurt or help patients. State Question 788, which passed in late June, legalized the sale and possession of marijuana plants and products without a limit on tetrahydrocannabinol, the chemical that produces euphoria in marijuana users.Read more on NewsOK.com