“We understand that DA’s may have emergencies while on-road, and especially during Covid, DAs have struggled to find bathrooms while delivering,” the letter said. Its next sentence was bolded and underlined: “Regardless, DAs cannot, MUST NOT, return bags to station with poop inside.”

The letter then addressed reported issues about “bottles of urine.”

“We’ve noticed an uptick recently of all kinds of unsanitary garbage being left inside bags: used masks, gloves, bottles of urine,” the letter said. The letter went on to discourage drivers from leaving such “unsanitary garbage” behind.

“I know it may seem obvious, or like something you shouldn’t need to coach, but please be explicit when communicating the message that they CANNOT poop, or leave bottles of urine inside bags,” the letter said. It concluded with a request that all recipients respond to confirm they received the message.

“Paying workers $15/hr doesn’t make you a ‘progressive workplace’ when you union-bust & make workers urinate in water bottles,” Pocan tweeted.

This story has been updated with additional information and background.