marijuana to help their children. dr. sanjay gupta introduces us to some of these families in a special report "weed 6: marijuana and autism." >> it was on a car ride like this when they first tried marijuana. rides that before cannabis they never even dreamed of taking because this would happen. [ screaming ] but one day in june of 2009, they had no choice. kara had an important doctor's appointment five hours away in galveston, texas. christy and mark decided to try the marijuana brownies that their neighbor had made. >> i just gave it to her and she ate it and it was about an hour where she was sitting, no longer rocking, no longer hand slapping, no longer hitting, and she's sitting there and looking out the window and she's looking