15 USC 3004 - Regulation of interstate off-track wagering

(a) Consent of host racing association, host racing commission, and off-track racing commission as prerequisite to acceptance of wager 
An interstate off-track wager may be accepted by an off-track betting system only if consent is obtained from
(1) the host racing association, except that
(A) as a condition precedent to such consent, said racing association (except a not-for-profit racing association in a State where the distribution of off-track betting revenues in that State is set forth by law) must have a written agreement with the horsemens group, under which said racing association may give such consent, setting forth the terms and conditions relating thereto; provided,
(B) that where the host racing association has a contract with a horsemens group at the time of enactment of this chapter which contains no provisions referring to interstate off-track betting, the terms and conditions of said then-existing contract shall be deemed to apply to the interstate off-track wagers and no additional written agreement need be entered into unless the parties to such then-existing contract agree otherwise. Where such provisions exist in such existing contract, such contract shall govern. Where written consents exist at the time of enactment of this chapter between an off-track betting system and the host racing association providing for interstate off-track wagers, or such written consents are executed by these parties prior to the expiration of such then-existing contract, upon the expiration of such then-existing contract the written agreement of such horsemens group shall thereafter be required as such condition precedent and as a part of the regular contractual process, and may not be withdrawn or varied except in the regular contractual process. Where no such written consent exists, and where such written agreement occurs at a racing association which has a regular contractual process with such horsemens group, said agreement by the horsemens group may not be withdrawn or varied except in the regular contractual process;

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(2) the host racing commission;
(3) the off-track racing commission.
(b) Approval of tracks as prerequisite to acceptance of wager; exceptions 

(1) In addition to the requirement of subsection (a) of this section, any off-track betting office shall obtain the approval of
(A) all currently operating tracks within 60 miles of such off-track betting office; and
(B) if there are no currently operating tracks within 60 miles then the closest currently operating track in an adjoining State.
(2) Notwithstanding the provisions of paragraph (1) of this subsection, any off-track betting office in a State with at least 250 days of on-track parimutuel horseracing a year, may accept interstate off-track wagers for a total of 60 racing days and 25 special events a year without the approval required by paragraph (1), if with respect to such 60 racing days, there is no racing of the same type at the same time of day being conducted within the off-track betting State within 60 miles of the off-track betting office accepting the wager, or such racing program cannot be completed. Excluded from such 60 days and from the consent required by subsection (b)(1) of this section may be dark days which occur during a regularly scheduled race meeting in said off-track betting State. In order to accept any interstate off-track wager under the terms of the preceding sentence the off-track betting office shall make identical offers to any racing association described in subparagraph (A) of subsection (b)(1) of this section. Nothing in this subparagraph shall be construed to reduce or eliminate the necessity of obtaining all the approvals required by subsection (a) of this section.
(c) Takeout amount 
No parimutuel off-track betting system may employ a takeout for an interstate wager which is greater than the takeout for corresponding wagering pools of off-track wagers on races run within the off-track State except where such greater takeout is authorized by State law in the off-track State.