Starting in 2007 Fisher were reintroduced to the Olympic Penninsula. The last release was in 2011. They have ben very wide ranging. One getting as far as Centralia. I do not know of any being trapped yet by trappers but I have heard of a few sightings. Supposedly they are an easily trapped animal so I would expect one to show up in a cage trap if there population was to become well established.
Some unanswered questions out there that WDFW seems not concerned with like what is there effect on native marten, bobcats and prey animals for these predators.
I see now through an aricle in the Centralia Chronicle which I cannot link to, the next phase of reintrodution is being planned, reintroduction to the South Cascades.
In other areas fisher are detrimental to small game species and Marten. I know on the Olympic Penninsula where I live Mountain Beaver populations are way down. I don't know if this is coincidence. No one has looked into it.
Anyway, thought I would let you know, like it or not Fisher are on there way back. They are a protected species so if you ever catch one they must be released.
I would like to hear from anyone that catches one. It will be interesting to find out how they effect trapping.