United States <a href="https://en.wikipedia.org/wiki/Food_and_Drug_Administration" id="mwAQ0" rel="mw:WikiLink" title="Food and Drug Administration">Food and Drug Administration</a> requires all <a href="https://en.wikipedia.org/wiki/Blood_donation" id="mwAQ4" rel="mw:WikiLink" title="Blood donation">blood donations</a> to be labeled "paid" or "volunteer" donors.