While expressing support for limited use of medical marijuana, law enforcement officials from across the state Wednesday warned of a slippery slope leading to legalized recreational use. Their warning came during a hearing at Georgia Gwinnett College in Lawrenceville of the Joint Study Committee on Prescription of Medical Cannabis for Serious Medical Conditions. State lawmakers are considering allowing the use of cannabis oil — which contains anti-inflammatory and anti-anxiety cannibidiols but is free of THC, the psychoactive ingredient that gets people high — to treat children with seizure disorders.