49 U.S.C. § 30106 : US Code - Section 30106: Rented or leased motor vehicle safety and responsibility

      (a) In General. - An owner of a motor vehicle that rents or
    leases the vehicle to a person (or an affiliate of the owner) shall
    not be liable under the law of any State or political subdivision
    thereof, by reason of being the owner of the vehicle (or an
    affiliate of the owner), for harm to persons or property that
    results or arises out of the use, operation, or possession of the
    vehicle during the period of the rental or lease, if - 
        (1) the owner (or an affiliate of the owner) is engaged in the
      trade or business of renting or leasing motor vehicles; and
        (2) there is no negligence or criminal wrongdoing on the part
      of the owner (or an affiliate of the owner).

      (b) Financial Responsibility Laws. - Nothing in this section
    supersedes the law of any State or political subdivision thereof - 
        (1) imposing financial responsibility or insurance standards on
      the owner of a motor vehicle for the privilege of registering and
      operating a motor vehicle; or
        (2) imposing liability on business entities engaged in the
      trade or business of renting or leasing motor vehicles for
      failure to meet the financial responsibility or liability
      insurance requirements under State law.

      (c) Applicability and Effective Date. - Notwithstanding any other
    provision of law, this section shall apply with respect to any
    action commenced on or after the date of enactment of this section
    without regard to whether the harm that is the subject of the
    action, or the conduct that caused the harm, occurred before such
    date of enactment.
      (d) Definitions. - In this section, the following definitions
    apply:
        (1) Affiliate. - The term "affiliate" means a person other than
      the owner that directly or indirectly controls, is controlled by,
      or is under common control with the owner. In the preceding
      sentence, the term "control" means the power to direct the
      management and policies of a person whether through ownership of
      voting securities or otherwise.
        (2) Owner. - The term "owner" means a person who is - 
          (A) a record or beneficial owner, holder of title, lessor, or
        lessee of a motor vehicle;
          (B) entitled to the use and possession of a motor vehicle
        subject to a security interest in another person; or
          (C) a lessor, lessee, or a bailee of a motor vehicle, in the
        trade or business of renting or leasing motor vehicles, having
        the use or possession thereof, under a lease, bailment, or
        otherwise.

        (3) Person. - The term "person" means any individual,
      corporation, company, limited liability company, trust,
      association, firm, partnership, society, joint stock company, or
      any other entity.