I am going to link two articles since they tie in pretty close to each other.
California Law Article:
California Could Finally Put A Lane-Splitting Law On The BooksUC-Berkley Study Article:
UC Berkeley Study Finds Lane-Splitting Is Safe If You're SmartI like this, I think both the Study and the Proposed California Law that seems to reflect some of the studies findings could pave the way for more States to adopt similar legislation.