Bioethics is concerned with the ethical and philosophical implications of biological and medical research, procedures, technologies, and treatments. Areas of concern range from informed consent, patient safety, and conflicts of interest to the broader social and political meanings of biotechnologies. Some critics have suggested that bioethicists too often provide justifications for questionable scientific experiments, and that their focus on doctor-patient and researcher-subject relationships tends to obscure broader social concerns. Others have accused bioethicists of placing unnecessary obstacles in the way of scientific investigations. Nonetheless, some scientists are increasingly asking for ethical input at early stages of their research to anticipate potential ethical problems.