15 U.S. Code § 3905 - Clarification concerning permissible State authority
Nothing in this chapter shall be construed to exempt a risk retention group or purchasing group authorized under this chapter from the policy form or coverage requirements of any State motor vehicle no-fault or motor vehicle financial responsibility insurance law.
The exemptions provided under this chapter shall apply only to the provision of liability insurance by a risk retention group or the purchase of liability insurance by a purchasing group, and nothing in this chapter shall be construed to permit the provision or purchase of any other line of insurance by any such group.
The terms of any insurance policy provided by a risk retention group or purchased by a purchasing group shall not provide or be construed to provide insurance policy coverage prohibited generally by State statute or declared unlawful by the highest court of the State whose law applies to such policy.
Subject to the provisions of section 3902(a)(4) of this title relating to discrimination, nothing in this chapter shall be construed to preempt the authority of a State to specify acceptable means of demonstrating financial responsibility where the State has required a demonstration of financial responsibility as a condition for obtaining a license or permit to undertake specified activities. Such means may include or exclude insurance coverage obtained from an admitted insurance company, an excess lines company, a risk retention group, or any other source regardless of whether coverage is obtained directly from an insurance company or through a broker, agent, purchasing group, or any other person.