Attorney General Ken Paxton is suing a third doctor for allegedly prescribing hormone treatment to minors in violation of the state’s ban on gender-affirming care. Paxton accuses Dr. M. Brett Cooper, an associate professor at UT Southwestern Medical Center who also practiced at Children’s Medical Center Dallas, of prescribing various levels of testosterone cypionate to 15 patients between the ages of 14 and 17. Most patients listed in the lawsuit were between 16 and 17 years old.