The The Omnibus Budget Reconciliation Act of 1993 section of the law that applies to Special Needs Trusts and “Pooled Trusts”:
If you have difficulty understanding the law, you can read how to read nested laws on the Conservationship webpage here: http://raisingautism.net/conservatorship.html#readingSec. 1917. [42 U.S.C. 1396p]
(d)(1) For purposes of determining an individual’s eligibility for, or amount of, benefits under a State plan under this title, subject to paragraph (4), the rules specified in paragraph (3) shall apply to a trust established by such individual.
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(2)(A) For purposes of this subsection, an individual shall be considered to have established a trust if assets of the individual were used to form all or part of the corpus of the trust and if any of the following individuals established such trust other than by will:
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(i) The individual.
(ii) The individual’s spouse.
(iii) A person, including a court or administrative body, with legal authority to act in place of or on behalf of the individual or the individual’s spouse.
(iv) A person, including any court or administrative body, acting at the direction or upon the request of the individual or the individual’s spouse.
(C) Subject to paragraph (4), this subsection shall apply without regard to—
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(i) the purposes for which a trust is established,
(ii) whether the trustees have or exercise any discretion under the trust,
(iii) any restrictions on when or whether distributions may be made from the trust, or
(iv) any restrictions on the use of distributions from the trust.
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(i) the corpus of the trust shall be considered resources available to the individual,
(ii) payments from the trust to or for the benefit of the individual shall be considered income of the individual, and
(iii) any other payments from the trust shall be considered assets disposed of by the individual for purposes of subsection (c).
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(i) if there are any circumstances under which payment from the trust could be made to or for the benefit of the individual, the portion of the corpus from which, or the income on the corpus from which, payment to the individual could be made shall be considered resources available to the individual, and payments from that portion of the corpus or income—
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(I) to or for the benefit of the individual, shall be considered income of the individual, and
(II) for any other purpose, shall be considered a transfer of assets by the individual subject to subsection (c); and
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(A) A trust containing the assets of an individual under age 65 who is disabled (as defined in section 1614(a)(3)) and which is established for the benefit of such individual by a parent, grandparent, legal guardian of the individual, or a court if the State will receive all amounts remaining in the trust upon the death of such individual up to an amount equal to the total medical assistance paid on behalf of the individual under a State plan under this title.
(B) A trust established in a State for the benefit of an individual if—
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(i) the trust is composed only of pension, Social Security, and other income to the individual (and accumulated income in the trust),
(ii) the State will receive all amounts remaining in the trust upon the death of such individual up to an amount equal to the total medical assistance paid on behalf of the individual under a State plan under this title, and
(iii) the State makes medical assistance available to individuals described in section 1902(a)(10)(A)(ii)(V), but does not make such assistance available to individuals for nursing facility services under section 1902(a)(10)(C).
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(i) The trust is established and managed by a nonprofit association.
(ii) A separate account is maintained for each beneficiary of the trust, but, for purposes of investment and management of funds, the trust pools these accounts.
(iii) Accounts in the trust are established solely for the benefit of individuals who are disabled (as defined in section 1614(a)(3)) by the parent, grandparent, or legal guardian of such individuals, by such individuals, or by a court.
(iv) To the extent that amounts remaining in the beneficiary’s account upon the death of the beneficiary are not retained by the trust, the trust pays to the State from such remaining amounts in the account an amount equal to the total amount of medical assistance paid on behalf of the beneficiary under the State plan under this title.
(6) The term “trust” includes any legal instrument or device that is similar to a trust but includes an annuity only to such extent and in such manner as the Secretary specifies.
https://www.ssa.gov/OP_Home/ssact/title19/1917.htm