You may also want to find out if they have been involved in homes with other stigma as well (e.g. fires, hurricane losses). Some homes may be difficult to sell, too, for other reasons (e.g. a death at the home). You would want to ask them how they dealt with that issue. Be comfortable asking for references from prior clients for realtors, or for any other professional you hire (e.g. contractors, lawyers, accountants, etc.). Any professional who is uncomfortable providing references for matters similar to yours is likely to be someone you do not want to work with anyway.