Washington has not yet taken individual action to clarify if consumption of hemp products is legal in their state. They currently are following the federal guidelines that are in place. This is promising. Many states that are opposed to the use of CBD oil took it upon themselves to clarify their stance. The fact that Washington DC has allowed federal law to dictate their current opinion on CBD shows that they may eventually make it legal.
Once the plants are harvested, the next step is to extract the CBD. One commonly used method is alcohol extraction, where the plant is soaked in a grain alcohol solvent. After it is soaked, the liquid that remains is high in CBD. The solvent is then evaporated and voila! You are left with potent CBD oil. CO2 extraction is another common method, but it is much more complex.