Well at least I guessed right on this.......
BOCA NATIONAL CODE
502.1 Dwelling units. Every dwelling unit shall contain its own bathtub or shower,
lavatory, water closet and kitchen sink which shall be maintained in a sanitary, safe
working condition. The lavatory shall be placed in the same room as the water closet or
located in close proximity to the door leading directly into the room in which such water
closet is located.
A kitchen sink shall not be used as a substitute for the required lavatory.Well I put a larger sink in the bath area so as to be able to wash up a few dishes without giving up counter space in the kitchen.
Looks as if you can wash dishes in the bathroom but you can not wash your hands in the kitchen after a poo poo.