12 USC 25a - Participation by national banks in lotteries and related activities

(a) Prohibited activities 
A national bank may not
(1) deal in lottery tickets;
(2) deal in bets used as a means or substitute for participation in a lottery;
(3) announce, advertise, or publicize the existence of any lottery;

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(4) announce, advertise, or publicize the existence or identity of any participant or winner, as such, in a lottery.
(b) Use of banking premises prohibited 
A national bank may not permit
(1) the use of any part of any of its banking offices by any persons for any purpose forbidden to the bank under subsection (a) of this section, or
(2) direct access by the public from any of its banking offices to any premises used by any person for any purpose forbidden to the bank under subsection (a) of this section.
(c) Definitions 
As used in this section
(1) The term deal in includes making, taking, buying, selling, redeeming, or collecting.
(2) The term lottery includes any arrangement whereby three or more persons (the participants) advance money or credit to another in exchange for the possibility or expectation that one or more but not all of the participants (the winners) will receive by reason of their advances more than the amounts they have advanced, the identity of the winners being determined by any means which includes
(A) a random selection;
(B) a game, race, or contest; or
(C) any record or tabulation of the result of one or more events in which any participant has no interest except for its bearing upon the possibility that he may become a winner.

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(3) The term lottery ticket includes any right, privilege, or possibility (and any ticket, receipt, record, or other evidence of any such right, privilege, or possibility) of becoming a winner in a lottery.
(d) Lawful banking services connected with operation of lotteries 
Nothing contained in this section prohibits a national bank from accepting deposits or cashing or otherwise handling checks or other negotiable instruments, or performing other lawful banking services for a State operating a lottery, or for an officer or employee of that State who is charged with the administration of the lottery.
(e) Regulations; enforcement 
The Comptroller of the Currency shall issue such regulations as may be necessary to the strict enforcement of this section and the prevention of evasions thereof.