https://www.independent.co.uk/news/world/americas/us-election/kamala-harris-police-biden-vp-pick-california-senate-a9662801.html

But over the years, she has proudly labelled herself both a “top cop” and a “progressive prosecutor”.

https://www.motherjones.com/politics/2019/12/kamala-was-a-cop-black-people-knew-it-first/

She’d even proudly declared herself California’s “top cop” in 2016 —two years after the Ferguson protests. Marcotte has things backward. In a climate where Democrats still felt they had to pander to the law-and-order crowd, “Kamala is a cop” was the nuance.

These legitimate critiques, not trolls hiding behind computer screens, gave the “Kamala is a cop” meme its power. Black Americans, who have wildly disproportionate contact with police and prisons, had cause to be wary of a presidential candidate, even a Black woman, who not only made her bones in the criminal justice system but adduced her work there to the case for her presidency. On Black Twitter, the meme was a reminder, not an explanation. Early on, Harris struggled to attract Black voters. Some were concerned about her electability, while others were truly mistrustful of her record and her promise to be the “progressive prosecutor” candidate.

https://www.c-span.org/program/campaign-2016/new-york-delegation-breakfast/450152

At 00:32:19 her speech begins, which has (via the transcript):

ELECTED FIRST WOMAN OF COLOR TO BE DISTRICT ATTORNEY IN STATE OF CALIFORNIA IN 2003. [APPLAUSE] AND I NOW STAND BEFORE YOU AS THE TOP COP OF THE BIGGEST STATE IN THE COUNTRY, NO OFFENSE ERIC SCHNEIDERMAN. [LAUGHTER]