When you apply for jobs in California, you may wonder whether you should disclose a history of cancer. The answer, generally, is no, and if potential employers ask questions such as, "How much sick leave have you taken in the past five years?" you are well within your rights not to answer. In fact, such a question is illegal. This holds true no matter the type of job you are applying for, be it marketing specialist, actress, fundraising director or executive assistant.