Imagine you were a diabetic and you had a prescription for insulin from one state and then when you were traveling to another, you were stopped and your medicine was seized because you did not have a valid prescription from the state you are in. It would make life pretty difficult. Each time you traveled you would have to get a new prescription. This doesn't sound very healthy for patients. Just substitute marijuana for insulin and any marijuana patient for diabetic. If it doesn't sound right for a diabetic, it isn't right for a medical marijuana patient.