All facets of science are regulated by ethical guidelines. A significant portion of scientific study need not however be concerned with these as the majority of experimentation that occurs in those areas is independent of human subjects; most chemistry is an example of this. I agree that moral standards are extremely subjective, but in most cases can be generalized when it comes to matters like this, for example nobody will kill enough people to make a viable conclusion on the idea that smoking causes lung cancer. So in a way, scientific progression regulates itself, as the vast vast majority of people will not go to extreme lengths for progression.