The rules of behavior an individual or a group may follow out of personal conscience and that are not necessarily part of legislated law in the United States.
Moral law is a system of guidelines for behavior. These guidelines may or may not be part of a religion, codified in written form, or legally enforceable. For some people moral law is synonymous with the commands of a divine being. For others, moral law is a set of universal rules that should apply to everyone.
Ethical principles held primarily by the followers of Christianity have influenced the development of U.S. secular law. As a result, Christian moral law and secular law overlap in many situations. For example, murder, theft, prostitution, and other behaviors labeled immoral are also illegal. Moral turpitude is a legal term used to describe a crime that demonstrates depravity in one’s public and private life, contrary to what is accepted and customary. People convicted of this crime can be disqualified from government office, lose their license to practice law, or be deported (in the case of immigrants).
Passing laws is relatively easy when public policy makers can unanimously identify behavior that is socially unacceptable. Policy makers can then attempt to enforce socially correct behavior through legal channels. However, in many other situations, it is far more difficult to determine what behavior the government should promote, if any. When a government seeks to implement a code of conduct that may conflict with the U.S. Constitution, the courts are generally called upon to determine the law’s validity.