IF you want a serious, well defined ruling on what is considered baiting I have an email address for a WDFW agent for you (PM me for it if interested). He WILL respond, and will do so in a timely manner. I've conversed with him several times.
As for the actual law regarding baiting:
RCW 77.15.245
Unlawful practices — Black bear baiting — Exceptions — Illegal hunting — Use of dogs — Exceptions — Penalties.
(1) Notwithstanding the provisions of RCW 77.12.240, 77.36.020, 77.36.030, or any other provisions of law, it is unlawful to take, hunt, or attract black bear with the aid of bait.
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(d) As used in this subsection, "bait" means a substance placed, exposed, deposited, distributed, scattered, or otherwise used for the purpose of attracting black bears to an area where one or more persons hunt or intend to hunt them.
(2) Notwithstanding RCW 77.12.240, 77.36.020, 77.36.030, or any other provisions of law, it is unlawful to hunt or pursue black bear, cougar, bobcat, or lynx with the aid of a dog or dogs.
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(4) A person who violates subsection (1) or (2) of this section is guilty of a gross misdemeanor. In addition to appropriate criminal penalties, the department shall revoke the hunting license of a person who violates subsection (1) or (2) of this section and order the suspension of wildlife hunting privileges for a period of five years following the revocation. Following a subsequent violation of subsection (1) or (2) of this section by the same person, a hunting license shall not be issued to the person at any time.
{The "........" are where exceptions are listed....I did this in an effort to be brief. Essentially, it just says the WDWF can issue special permits, or are authorized to bait if required as an exception to the law}
You can see that, unlike many other states that have banned baiting, Washington's definition is pretty broad.
In other states, you'll find the terms "that can be ingested" in the laws, but this isn't the case in Washington's written law.
I would get an official "ruling" from a qualified agent, as I've heard others (not WDWF Agents) in the past say that you're okay to use scents--just nothing a bear can eat. Lawfully, though, the books don't say this.
My honest opinion?
Don't eve try it..it's not worth losing your license for 5 years, and putting some bad marks next to your name. Don't forget they have a right so seize anything that was used in the effort as well, which includes rifles, hunting gear, your truck, etc.
Now, also notice that the law doesn't say anything about "natural" bait sites...which would include dear/elk carcasses or "dressings" from other hutner's success. You could set up around these and hope for a bear to come around--but as soon as you move or touch 'em, you're committing a crime.
Your best bet is to find the berries...you'll find the bear. Try higher elevation huckleberry/blueberry fields in early season, then move lower to the blackberries as the season progresses. Berry patches are great natural "bait" sites. Just don't collect berries and pile 'em up in an area--as that WOULD constitue baiting.