also from their site:
http://www.mwrcenter.com/whydidwecontact.php
for some reason you wish not to participate in a survey simply state your desires and you will not be contacted concerning that research issue again. Since your opinions and experiences are of such a high value we will respect your requests. We keep an internal list of households that do not wish to be contacted concerning any research matter regardless of the topic. If you wish to have your name added to this list simply email your household’s telephone number to
[email protected]. This internal list is not affiliated with the federal Do Not Call list. Since we are not telemarketing (selling products via the telephone) we do not fall under the governance of the Do Not Call list.