1,000-year flood. there is a suggestion this week that women can change how often they undergo a screen deeg signed to detect cancer. i m jim vance. i m doreen gentzler. earlier it was mammograms. now a doctors group is saying st women in their 20s can have a pap smear every two years instead of annually. tracie potts has more on the story. reporter: it s a lot for women to digest and try to break apart and understand. like you said, for the second time in just a few days, scientists and experts have turned conventional wisdom on its head recommending that women get fewer screenings based on science. annual pap smears to detect cervical cancer are no longer necessary for most women. the american college of ob-gyn said today. women under 21 don t need them at all. women in their 20s can get them every other year, and women over with a history of normal pap smears can be screened every three years and stop when they re 65 or 70. experts said because cervical cancer develop