September 1st 1987 Watchtower:
Hence, before a Christian takes an oath or puts himself under a confidentiality restriction, whether in connection with employment or otherwise, it would be wise to determine to the extent possible what problems this may produce because of any conflict with Bible requirements. How will one handle matters if a brother or a sister becomes a client? Usually such jobs as working with doctors, hospitals, courts, and lawyers are the type of employment in which a problem could develop. We cannot ignore Caesar’s law or the seriousness of an oath, but Jehovah’s law is supreme.Also see: http://www.jehovahs-witness.com/topic/100315/tell-elders-shes-had-abortion?page=1