August 13, 2015 8:00 AM EDT

For the past year, New York-based Natalie Keyssar has been photographing the Black Lives Matter movement as it spread across the country. She was in Ferguson, Mo., after Michael Brown, an unarmed black man, was killed by a white police officer. She traveled to Baltimore when Freddie Gray died while in police custody last April. And she covered the aftermath of Eric Garner’s death in Staten Island, N.Y.

So when TIME asked her to embed with the police officers of West Philadelphia’s District 19 for a week, she didn’t hesitate. “As a photojournalist my interactions with police are almost always quick and frequently during moments of high tension, so having this time to see how they work, hear how they feel, and see what their daily lives are like during this pivotal moment for policing in America, was an amazing opportunity,” she tells TIME.

During her assignment, Keyssar would spend more than 12 hours a day with police officers, often on patrols. “I’d arrive at the station most days between 10:00 a.m. and noon, which allowed me to catch three different patrols each day,” she says. “I spent the rest of my time at the station, photographing officers [as they] do paperwork, eat bagged lunches and talk about their experiences on the street.”

Read Karl Vick’s report on What It’s Live Being a Cop Today in this week’s issue of TIME

At first, the officers were wary of her presence — on any story, a photographer needs to create a trusting relationship with his or her subjects. “It’s sort of universal in a certain way,” Keyssar says. “I’m a big believer in threading lightly, letting people get a feel for you before shooting, especially if you have the time,” she says. That means spending time with your camera hanging on your shoulder, looking people in the eyes and talking to them; letting them getting used to you. “These officers are not accustomed to having an outsider in there,” she explains. “For the first 48 hours, my presence there was a bit off-putting – not in negative way, it was just surprising for them to see a girl running around with a camera. They want to know that you don’t see them as caricatures.”

Photograph by Natalie Keyssar for TIME

Once that initial apprehension disappeared, she fell into the district’s rhythm, allowing her to engage on a more personal level with the officers. Keyssar particularly remembers one instance when, between pat downs and car stops, both officers who she was shadowing pulled out their iPhones and FaceTimed their children. At that moment, she says, their tense demeanor disappeared: “They became parents. They became like anybody else. Seeing those very quick transitions between police officers and moms or dads, that was pretty powerful for me.”

After her week spent in that district, Keyssar feels her perspective on the police has changed. “I’ve spent a lot of time in my career standing next to protesters, and I’ve seen police from that side — they are sort of a caricature [from that side]. They are doing a job and they are sort of representing a system. They are not allowed to express their feelings and that can be dehumanizing,” she says. “I think, after this assignment, I’ll carry that more human perspective. Whether these people are representing the system or not, and whether there are failures within that system that need to be addressed, there are also human elements that I feel are…forgotten.”

And Keyssar’s hope is that others will see it too – at least in her photos.

Natalie Keyssar is a freelance photojournalist and Story Contributor at Institute for Artist Management. She is based in New York.

Myles Little, who edited this photo essay, is an Associate Photo Editor at TIME.

Olivier Laurent is the editor of TIME LightBox. Follow him on Twitter and Instagram @olivierclaurent

Contact us at letters@time.com.

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