The lawsuit Patricia Lawson filed Tuesday against Texas Health Presbyterian Hospital of Dallas is a straightforward discrimination claim. Lawson, a 64-year-old surgical systems supervisor with two decades' experience at the hospital, says Presby fired her in October 2012 for being too old and a woman. The hospital didn't admit that, of course. No sensible HR manager would fire a member of a protected class without first scrounging up some legally defensible justification. So, when the hospital told Lawson she was fired, it said it had caught her violating Texas Health Resources' code of conduct.