Washington State Gambling Law
(1) The legislature authorizes a business to conduct a promotional contest of chance as defined in this section, in this state, or partially in this state, whereby the elements of prize and chance are present but in which the element of consideration is not present.
(2) Promotional contests of chance under this section are not gambling as defined in RCW 9.46.0237
Washington Code RCW 9.46.0356
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Washington State Gambling Commission Pamphlet on Free Poker as a Business Click Here