A law requiring women to undergo a waiting period before obtaining an abortion is unconsitutional, the Iowa Supreme court ruled.The court issued an opinion Friday that law requiring a woman seeking abortion services at any stage of her pregnancy undergo a preliminary 72-hour waiting period “violates the right to equal protection under the Iowa Constitution” and should not be upheld.Twenty-seven states require women seeking an abortion to wait a specified amount of time, most often 24 hours, according to the Guttmacher Institute, a reproductive health care policy and research organization.