I believe the law actually says that you cannot take from the wild or maintain any wildlife species native to the state of washington, except those concidered as a nucience or pest.
I believe they have also outlawed keeping any venomous or poisoness animal without a permit. I could be wrong on the last part though.
The way I read it in the past was that you cannot have a rubber boa period, because it is a native species.
Fish and Game of spokane have confirmed this for me.
Thanks,
Steve
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Steve Perry
North Idaho.