Demetria Forte had been working as an Amazon driver for a few months when she had a miscarriage while on the clock.

Technically, she was employed by Battle-Tested Strategies (BTS), one of Amazon’s roughly three thousand delivery service partners (DSPs). But in every meaningful sense of the term, she was an Amazon worker. She and her coworkers wear Amazon-branded uniforms, drive Amazon-branded vehicles, and the company determines their routes, monitoring them throughout their shifts.

On the day of her miscarriage, Forte was working a regular shift, which takes her through the high desert climate around Palmdale, California, at the foot of the San Gabriel Mountains, where BTS is located. Temperatures can reach 110 degrees, and the Palmdale drivers are quick to note that Amazon’s decision to hold Prime Day at the height of summer means that they are pushed to their limits during the hottest time of the year. As Forte and several of her coworkers told me, many of the delivery vans did not have functioning air-conditioning (AC).