What's special about molecular genetic diagnostics?

In its first part, this paper seeks to make plausible (a) that molecular genetic diagnostics differs in ethically relevant ways from traditional types of medical diagnostics and (b) that the consequences of introducing this technology in broad screening-programs to detect widespread genetic diseases in a population which is not at high risk may change our understanding of health and disease in a problematic way. In its second part, the paper discusses some aspects of public control of scientific and technological innovations in the field of molecular genetic diagnostics.