What is the penality?

[Humptulips]

Here is the statute
https://app.leg.wa.gov/RCW/default.aspx?cite=77.15.180
Penalty for a misdemeanor

https://app.leg.wa.gov/rcw/default.aspx?cite=9.92.030

Call your regional office and complain to enforcement. Maybe nothing will come of it but maybe something will. Most likely if they know who it is a talk from Enforcement will deter them from doing it a second time. Repeated offences will get more attention.
Truth is since they started requiring trials for minor offences like this, prosecutors don't want to be bothered. Enforcement knows this so why waste your time on the paperwork. Surprised?

[Jingles]

Thank you Bruce I was hoping there was some kind of legal within the law means of nailing the SOB's at least as a starting point then if the legal system fails time to solve the problem myself. But I will not give up what I can do and do enjoy just because some tree hugging (insert you favorite term) is opposed to what is legal.
I know I'll probably pizz some folks off this winter when snow actually starts to accumulate as the plow on the buggy (S x S )is going to keep some roads open for me to access my traps  and undoubtedly screw with their non groomed skinny ski trails.

[UrbanTrapper]

In WA State it is still a crime to interfere with a legally set trap (unless you own the land) and releasing a legally caught animal is also theft. I would press charges every time but as described above the prosecutor may not follow through for you. I would then see if a lawyer would, for a share of my awarded damages, take my case to small claims court. 

[OutHouse]

Were these offenses automatically going to some type of diversion program? Also, every crime ultimately has to be tried or pled out.

[Oh Mah]

sue her.https://aksportingjournal.com/trapper-squares-off-in-court/