Sample of Debt Exemption Certificate for SSI, Retirement, etc.
The link below is from the State of Oklahoma regarding debt collection. It contains an exemption form that is filed with the court BEFORE a debt collector can attach or garnish your exempt income. If the scumbags try to garnish before you have a chance to file this with the court after a judgment agreement, they are in violation of the law. However, check with your state rules of procedure - I think most of them provide for this opportunity for you to claim exemptions. This is just a sample to give you an idea of your rights.
http://www.oscn.net/forms/aoc_form/adobe/Form.22.pdf