Yes, for hunting upland game birds expandable broadheads are consider a lawful means of take. For your convenience on page 48 of the Upland Game, Furbearer & Turkey Seasons and Rules brochure there is a section outlining unlawful methods of take for upland game birds. I have copied and pasted this section here:
Unlawful Methods of Take
No person shall take upland game birds:
• From one-half hour after sunset to one-half hour before
sunrise. Upland game shall not be taken before 10 a.m.
on Fort Boise, C.J. Strike, Montour and Payette River
WMAs, during the pheasant season. Turkeys shall not be
taken from sunset to one-half hour before sunrise.
• With a trap, snare, net, crossbow, slingshot, hand-held or
thrown missiles, firearms except a shotgun using shells
not exceeding 3 ½ inches maximum length, except forest
grouse. Forest grouse shall not be taken with a trap, snare,
net or crossbow.
• From boats or other craft having a motor attached unless
the motor is completely shut off and forward progress has
ceased, or the boat is drifting naturally, or it is propelled
only by paddle, oars, or pole, or it is beached, moored or
resting at anchor. (2010-2011 Season)
• From any watercraft. (Effective 2011-2012 Season)
• By the use or aid of any electronic call.
• By the aid of baiting. Bait is defined as any substance
placed to attract game.