On Monday, April 30, the California Supreme Court issued a landmark [Dynamex Operations West v. Superior Ct., Cal. Sup. Ct., Dkt. No. S222732, 4/30/18] decision basically stating that the 
“ABC Test” is to be used when determining whether a worker is an employee or independent contractor for purposes of California wage orders. Previous to this latest decision the court case of S.G. Borello & Sons, Inc. v. Department of Industrial Relations, Cal. Sup. Ct., 769 P.2d 399, 3/23/89) was used to determine employee status. In that case the principal test of an employment relationship was whether the person to whom services were rendered has the right to control the manner and means of accomplishing the result desired. Under Dynamex, the Court embraced a standard that presumes all workers are employees instead of contractors and places the burden on classifying an independent contractor under the ABC test.
For a detailed analysis of this case and how you might have to adjust your hiring decisions, I will refer you to the Labor & Employment Law Blog posted by Timothy Kim for the law firm of Sheppard Mullin.