As discussed by our colleagues at the California Workplace Blog, California governor Jerry Brown has signed into law AB 1396, requiring all employers doing business in California to draft written contracts for any agreements with employees that involve commissions as a method of payment for services.  California joins New York in the vanguard of making such a writing a requirement.  N.Y. Labor Law § 191(1)(c).  Of course, such a writing remains a best practice under almost all circumstances.