It's gotta be more than weed:
"Actress Amanda Bynes is hospitalized
Actress Amanda Bynes was hospitalized for a mental health evaluation after deputies said she started a fire in the driveway of a home in Southern California. Deputies responding to a 911 call Monday night found Bynes, 27, standing next to the flames in Thousand Oaks, according to Ventura County sheriff’s Captain Don Aguilar. The deputies determined she met criteria for a mental health hold. She can be held for up to 72 hours of observation. No charges were filed."
Also see: 4/20: Bynes Leaves Me Breathless