The early diagnosis of Alzheimer disease is a boon in that it enables advance planning, but that planning process can engender conflict between respect for future-oriented autonomy and future welfare.
It is unconstitutional--and unethical--for physicians to participate in evidence-gathering against pregnant women suspected of being addicted to illegal substances without informing them of their constitutional rights or gaining their informed consent.
Specific contributions to a scientific article entitle the contributor to be included as an author; requests for authorship by those who have not made those specific contributions are unethical.