In the past years government has passed numerous laws and regulations which have impacted health care ethics. These laws and regulations include HIPAA, COBRA, FMLA, EMTALA and the law that provides your right to medical care despite whether or not you have insurance. Each of these has had a very important impact on health care ethics.
Here are several examples of legislation which have had a major impact on health care ethics. It is up to you and history to determine which has had the greatest impact.
As you can see, all of these laws and regulations have made an important impact on health care ethics. Which one is most important is a personal opinion and must be decided by you.