Washington State Legislature Pre-Employment Inquiry Law, excerpt.

SUBJECT
FAIR
PREEMPLOYMENT INQUIRIES
UNFAIR
PREEMPLOYMENT
INQUIRIES
Family
Whether applicant can meet specified work schedules or has activities, commitments or responsibilities that may prevent him or her from meeting work attendance requirements.
Specific inquiries concerning spouse, spouse’s gender, spouse’s employment or salary, children, child care arrangements, or dependents.
Pregnancy 
Inquiries as to a duration of stay on job or anticipated absences which are made to males and females alike.
All questions as to pregnancy, and medical history concerning pregnancy and related matters.