Until research unlocks medical understanding of marijuana, patients experiment

Lenny and Amy¿s 5-year-old son has epilepsy. When conventional medications caused terrible side effects, they started giving him a daily drop of cannabis oil, with dramatic results. But it¿s a calculated risk: While there is anecdotal evidence of cannabis¿ effectiveness, scientists face research roadblocks because it¿s a schedule 1 controlled substance. Science correspondent Miles O¿Brien reports.