alan shackelford is a harvard-trained physician. he is also among a handful of doctors in colorado who give prescriptions for medical marijuana. from the moment charlotte entered his office, he knew she was in trouble. while he was just examining her, she had two seizures. >> she had failed everything. there were no more options for her. everything had been tried, except cannabis. >> here's how scientists think it might work. marijuana is made up of two ingredients, thc -- that's the psychoactive part that makes you high, and cbd, also called cannabidiol. they think it regulates electric activity to help quiet the activity in the brain that causes the seizures. >> dr. julie holland is the editor of the pot book, a complete guide to cannabis. >> for a long time the work on cannabis and epilepsy was sort of inconclusive. maybe it works. maybe it doesn't. they couldn't quite figure it out. it's only when they really started separating thc from cbd that they saw definitively, yes, cbd seems to really stop seizures. >> so the figges need

alan shackelford is a harvard-trained physician. also among a handful of doctors in colorado who give prescriptions for medical marijuana. from the moment charlotte entered his office, he knew she was in trouble. while he was just examining her, she had two seizures. >> she had failed everything. there were no more options for her. everything had been tried, except cannabis. >> here's how scientists think it might work. marijuana is made up of two ingredients, thc -- that's the psychoactive part that makes you high, and cbd, also called cannabidiol. they think it regulates electric activity to help quiet the activity in the brain that causes the seizures. >> dr. julie holland is the editor of the pot book, a complete guide to cannabis. >> for a long time the work on cannabis and epilepsy was sort of inconclusive. maybe it works. maybe it doesn't. they couldn't quite figure it out. it's only when they really started separating thc from cbd that they saw definitively, yes, cbd seems to really stop seizures. >> so the figges needed to

alan shackelford is a harvard-trained physician.e is also among a handful of doctors in colorado who give prescriptions for medical marijuana. from the moment charlotte entered his office, he knew she was in trouble. while he was just examining her, she had two seizures. >> she had failed everything. there were no more options for her. everything had been tried, except cannabis. >> here's how scientists think it might work. marijuana is made up of two ingredients, thc -- that's the psychoactive part that makes you high, and cbd, also called cannabidiol. they think it regulates electric activity to help quiet the activity in the brain that causes the seizures. >> dr. julie holland is the editor of the pot book, a complete guide to cannabis. >> for a long time the work on cannabis and epilepsy was sort of inconclusive. maybe it works. maybe it doesn't. they couldn't quite figure it out. it's only when they really started separating thc from cbd that they saw definitively, yes, cbd seems to really stop seizures. >> so the figges needed

alan shackelford is a harvard-trained physician.lso among a handful of doctors in colorado who give prescriptions for medical marijuana. from the moment charlotte entered his office, he knew she was in trouble. while he was just examining her, she had two seizures. >> she had failed everything. there were no more options for her. everything had been tried, except cannabis. >> here's how scientists think it might work. marijuana is made up of two main ingredients, thc, that's the psychoactive part that makes you high. and cbd, also called cannabidiol. they think it regulates electric activity to help quiet the activity in the brain that causes the seizures. >> dr. julie holland is the editor of the pot book, a complete guide to cannabis. >> for a long time the work on cannabis and epilepsy was sort of inconclusive. maybe it works. maybe it doesn't. they couldn't quite figure it out. it's only when they really started separating thc from cbd that they saw definitively, yes, cbd seems to really stop seizures. >> so the figis needed to

. >> and charlotte's doctor, alan shackelford, also agrees.is commitment to medical marijuana has drawn criticism. he has even been called dr. feel good. >> how difficult is this for you to talk about as a physician? >> we are typically conservative as a profession and probably as individuals. we want more proof, and cannabis doesn't have that. >> and it's why he has traveled the world to look for researchers who might have the answers. that took him to the place many call the medical marijuana research capital. israel. it might surprise you, but actually, research into cannabis and epilepsy started here in the 1970s with studies showed it can reduce convulsions in rats. today shackleford is hoping to start clinical trials in humans there. >> we need to understand it well enough that they won't be reluctant to at least give it a thought. at least try it. >> and it's not just epilepsy, but researchers in israel are studying a variety of illnesses. when we come back, what they're finding up close, and an amazing look inside hospitals and nursing

alan shackelford is a harvard-trained physician.is also among a handful of doctors in colorado who give prescriptions for medical marijuana. from the moment charlotte entered his office, he knew she was in trouble. while he was just examining her, she had two seizures. >> she had failed everything. there were no more options for her. everything had been tried, except cannabis. >> here's how scientists think it might work. marijuana is made up of two ingredients, thc -- that's the psychoactive part that makes you high, and cbd, also called cannabidiol. they think it regulates electric activity to help quiet the activity in the brain that causes the seizures. >> dr. julie holland is the editor of the pot book, a complete guide to cannabis. >> for a long time the work on cannabis and epilepsy was sort of inconclusive. maybe it works. maybe it doesn't. they couldn't quite figure it out. it's only when they really started separating thc from cbd that they saw definitively, yes, cbd seems to really stop seizures. >> so the figges needed t

alan shackelford is a harvard-trained physician.lso among a handful of doctors in colorado who give prescriptions for medical marijuana. from the moment charlotte entered his office, he knew she was in trouble. while he was just examining her, she had two seizures. >> she had failed everything. there were no more options for her. everything had been tried, except cannabis. >> here's how scientists think it might work. marijuana is made up of two ingredients, thc -- that's the psychoactive part that makes you high, and cbd, also called cannabidiol. they think it regulates electric activity to help quiet the activity in the brain that causes the seizures. >> dr. julie holland is the editor of the pot book, a complete guide to cannabis. >> for a long time the work on cannabis and epilepsy was sort of inconclusive. maybe it works. maybe it doesn't. they couldn't quite figure it out. it's only when they really started separating thc from cbd that they saw definitively, yes, cbd seems to really stop seizures. >> so the figges needed to fi

alan shackelford is a harvard-trained physician.ful of doctors in colorado who give prescriptions for medical marijuana. from the moment charlotte entered his office, he knew she was in trouble. while he was just examining her, she had two seizures. >> she had failed everything. there were no more options for her. everything had been tried, except cannabis. >> here's how scientists think it might work. marijuana is made up of two ingredients, thc -- that's the psychoactive part that makes you high, and cbd, also called cannabidiol. they think it regulates electric activity to help quiet the activityn the brain that causes the seizures. >> dr. julie holland is the editor of the pot book, a complete guide to cannabis. >> for a long time the work on cannabis and epilepsy was sort of inconclusive. maybe it works. maybe it doesn't. they couldn't quite figure it out. it's only when they really started separating thc from cbd that they saw definitively, yes, cbd seems to really stop seizures. >> so the figges needed to find something that