Here you go Pete http://leginfo.ca.gov/pub/13-14/bill/asm/ab_0051-0100/ab_64_cfa_20130419_132025_asm_comm.html
1)Prohibits a driver of a ROHV from allowing a passenger to occupy a separate seat location not designed and provided by a manufacturer if the ROHV is model year 2014 or later.
2)Authorizes passengers in ROHVs of model year 2013 or earlier to occupy seat locations not designed and installed by the manufacturer provided that the occupant is fully contained inside the vehicle's rollover protection structure at all times while the vehicle is being operated