The question in Young's case is whether UPS violated the law through its policy of providing temporary light-duty work only to employees who had on-the-job injuries, were disabled under federal law or lost their federal driver certification. "If you were painting your house and fell off a ladder, or if you had a ski accident, that wouldn't qualify for restricted light duty. That's where pregnancy fell at that time. It was not covered in any state law except California's," Ross said.
The Obama administration and 120 congressional Democrats are supporting Young.
UPS employed Young as a part-time driver whose main job was to deliver overnight letters by 8:30 a.m. UPS requires people in those jobs to be able to lift packages as heavy as 70 pounds (32 kilograms). Young said she rarely handled anything over 20 pounds (9 kilograms)and dealt almost exclusively with letters that sat on the passenger seat of her van.
In 2006, Young, then in her mid-30s, took a leave of absence to undergo in vitro fertilization in her desire to have a third child. On the third try, she became pregnant.
Young wanted to return to work, and her doctor and a midwife wrote notes saying she should not lift packages heavier than 20 pounds (9 kilograms).
But UPS told Young she could not continue in her job and did not qualify for a temporary assignment.
Unable to work, Young also lost her medical and pension benefits, although she was covered under husband's health insurance. "The benefits were good and benefits were hard to find with part-time jobs," she said.
Young eventually returned to UPS, but left in 2009, a year after she sued. She argued that because UPS made accommodations for non-pregnant employees with work restrictions, it should have done the same for her.
But lower courts dismissed the suit, agreeing that Young did not prove UPS discriminated against her because of her pregnancy.
The justices agreed in July to review the case. Since then, there have been two notable developments.
The Equal Employment Opportunity Commission updated guidance to employers to make clear that they should accommodate people in Young's situation.
UPS itself has changed its policy so that pregnant employees will be eligible for light-duty work. The change does not affect Young, now a contractor for the federal Customs and Border Protection agency.
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Associated Press Writer Mark Sherman contributed to this report.