AUSTIN -- A proposal to ban abortion in Texas after 20 weeks reignited long-simmering tensions Wednesday night as conservatives in the Legislature sought to join other states in narrowing the legal window for terminating pregnancies.At least 10 states have passed bills outlawing abortions after 20 weeks of pregnancy on the disputed premise that a fetus can feel pain at that stage. Judges have struck down or temporarily blocked the law in several states, but Gov. Rick Perry and other top state Republicans remain undeterred.The bill's sponsor, Rep. Jodie Laubenberg, R-Parker, told members of the House State Affairs Committee that technological breakthroughs now provide "anatomical, behavioral and physiological evidence that a developing, unborn child is capable of feeling pain" if a woman waits too long to have an abortion."There's technology that we have now that we know more about the development, the feelings, of that unborn child," Laubenberg said. "We have an opportunity to make better decisions, not only about the child but the woman."Her measure would make doctors who perform the procedure after 20 weeks subject to losing their medical license, the same penalty those who perform abortions after 28 weeks can face under current law.The first public hearing on Laubenberg's proposal drew a crowd of passionate and at times testy activists on both sides of the issue to testify before the committee long into the evening.State Rep. Jessica Farrar, D-Houston, questioned whether the studies indicating fetal pain were peer-reviewed. She also noted that less than 2 percent of abortions occur after 20 weeks, to which Laubenberg replied, "One abortion, to me, is like one thousand."The committee also heard a measure by state Rep. Sarah Davis, R-Houston, seeking to remove requirements that doctors statewide inform women undergoing abortions that the procedure could increase their risk of breast cancer.Davis said that since 2003, women have been told of a specious link between abortion and breast cancer as part of Texas' "informed consent" requirements -- but there is no credible medical evidence for such a link."I think it was based more on ideology than science," Davis said of the 2003 law. She called the breast cancer link "patently offensive" given that the federal National Institutes of Health, the American Cancer Society and other top medical organizations say the theory is bunk.