cfm....no...i think all the springer's die or don't go upstream..so they take the heads...but not the coho...only those that die get checked for cwts..i'll check with the tag lab though...coho cannot go to the food bank if they get hit with benzocaine....or any fish that get's hit with ms-222...unless as you say they have 30 days to purge......fish for the food bank never go to the spawning room but come straight out of the seperator...only hit with co2....drugged fish can go to the renderers though as you say....and people i 've talked to say that yes conditions are good...but the main reason for the coho returns is more a lack of canandians fishin' them...which will change....maybe they could raise the limit for awhile....but not for long....