The Furbearer Trapping season and Rules 10/1/2009 through 3/31/2012 states,"Trappers shall attach to the chain of their traps or devices a legible metal tag with either the WDFW identification number of the trapper or the name and address of the trapper in English letters no less than one-eigth inch in height." Your WDFW number is also on the top of your hunting license and tags.