Pursuant to California AB 22 (read it here) most employers will not be permitted to review your credit report starting Janaury 1, 2012 (subject to several exceptions):

“This bill would prohibit an employer or prospective employer, with the exception of certain financial institutions, from obtaining a consumer credit report, as defined, for employment purposes unless the position of the person for whom the report is sought is (1) a position in the state Department of Justice, (2) a managerial position, as defined, (3) that of a sworn peace officer or other law enforcement position, (4) a position for which the information contained in the report is required by law to be disclosed or obtained, (5) a position that involves regular access to specified personal information for any purpose other than the routine solicitation and processing of credit card applications in a retail establishment, (6) a position in which the person is or would be a named signatory on the employer’s bank or credit card account, or authorized to transfer money or enter into financial contracts on the employer’s behalf, (7) a position that involves access to confidential or proprietary information, as specified, or (8) a position that involves regular access to $10,000 or more of cash, as specified.

This bill would also require the written notice informing the person for whom a consumer credit report is sought for employment purposes to also inform the person of the specific reason for obtaining the report, as specified.”