Here's the deal in WA state:
RCW 69.07.103
Chickens -- Slaughter, preparation, sale -- One thousand or fewer -- Special, temporary permit -- Rules -- Fee.
     *** CHANGE IN 2009 *** (SEE 5350-S.SL) ***
(1) A special, temporary permit issued by the department under this section is required for the slaughter and preparation of one thousand or fewer pastured chickens in a calendar year by the agricultural producer of the chickens for the sale of whole raw chickens by the producer directly to the ultimate consumer at the producer's farm, and for such sale. Such activities shall not be conducted without the permit. However, if the activities are conducted under such a permit, the activities are exempted from any other licensing requirements of this chapter.
     (2)(a) The department must adopt by rule requirements for a special, temporary permit for the activities described in subsection (1) of this section. The requirements must be generally patterned after those established by WAC 246-215-190 as it exists on July 27, 2003, for temporary food service establishments, but must be tailored specifically to these slaughter, preparation, and sale activities. The requirements must include, but are not limited to, those for: Cooling procedures, when applicable; sanitary facilities, equipment, and utensils; clean water; washing and other hygienic practices; and waste and wastewater disposal.
     (b) The rules must also identify the length of time such a permit is valid. In determining the length of time, the department must take care to ensure that it is adequate to accommodate the seasonal nature of the permitted activities. In adopting any rule under this section, the department must also carefully consider the economic constraints on the regulated activity.
     (3) The department shall conduct such inspections of the activities permitted under this section as are reasonably necessary to ensure compliance with permit requirements.
     (4) The fee for a special permit issued under this section is seventy-five dollars.
     (5) For the purposes of this section, "chicken" means the species Gallus domesticus.
To get the permit, you essentially need a commercial kitchen set-up. Then you can only amoratize over 1000 birds per year, which is a LONG pay off.
Again, poultry rules vary State by State and are not USDA regulated (unless you producer over 19,999 birds).  Know your local rules and don't leave your ass exposed.  Making a buck for a chicken isn't worth losing your house over.