A California civil liberties group launched a mobile application on April 30, that will let bystanders record cell phone videos of possible cases of police misconduct and then quickly save the footage to the organization’s computer servers.

The California chapter of the American Civil Liberties Union said the app will send the video to the organization and preserve it even if a phone is seized by police or destroyed.

The launch of the ACLU’s “Mobile Justice CA” app comes as law enforcement agencies face scrutiny over the use of lethal force, especially against African-Americans, following several high-profile deaths of unarmed black men in encounters with police over the last year in the United States.

“It’s critical that people understand what is being done by police officers, because what is being done is being done in the name of the public,” said Hector Villagra, executive director of the ACLU of Southern California.

The app is targeted at residents of the most populous U.S. state, but ACLU chapters have launched similar mobile apps in at least five other states, including New York, Missouri and Mississippi over the last three years.

It also sends an alert to anyone with the app who might be in the area, giving them an opportunity to go to the location and observe, the ACLU said.