COLUMBIA - A bill that seeks to allow children with severe epilepsy to legally use oil derived from marijuana has advanced to the Senate floor, but it's so restrictive, supporters say it won't help those for whom it's written.

The Senate Medical Affairs Committee approved Thursday allowing use of cannabidiol, or CBD oil, but only as part of clinical trials testing federally approved drugs.

Sen. Tom Davis said he wanted to allow wider use of CBD oil to control seizures. But the South Carolina Medical Association and State Law Enforcement Division raised concerns about purity of oils not controlled by the Food and Drug Administration, and he knew the bill stood no chance with their opposition.

Harriett Hilton of Beaufort says clinics trials are extremely limited and won't help her granddaughter.