GREENSBORO, Md. - The American Civil Liberties Union is now weighing in on the case involving the death of Caroline County teen, Anton Black. Black died in September after a chase and struggle during his arrest outside his home in Greensboro. The Maryland ACLU demands the either the State of Maryland or the U.S. Department of Justice independently investigate Black's case. After reviewing police body cam footage, the ACLU says it is "deeply troubled by the excessive police force and brutality in Anton's death".

On Thursday, Caroline County State's Attorney, Joseph Riley, gave the Greensboro Police Department permission to release that body cam footage. The video is 37-minutes long and shows the interaction between Black and Greensboro Police Officer Thomas Webster, followed by a chase and Black's arrest.

The video police gave WBOC does not show Webster approaching the scene but begins with Webster already speaking with Black.

The video first starts with Black standing on the left. Officer Webster is questioning him. On the right is a 12 year-old boy who police say was a friend and who police say Black tried to abduct. The conversation ends quickly as Black turns around and starts running away from Webster.

Webster doesn't run after Black right away. Instead, Webster gets into his patrol car and drives.

But it's not long after that when Webster leaves the car and starts running. More police units arrive.

Webster eventually catches up and immediately goes up to a car with Black inside before smashing the car window with a baton. Webster then uses a Taser.

Black gets out of the passenger side of the car and, what follows, is more than a minute of struggling. At one point, you hear Black screaming. Eventually three men get Black on the porch outside of his home.

It's hard to see what happens next, but Black's wrists are handcuffed and then his ankles - shackled.

"He's having a rough time," one person says in the video.

Later, police prop Black up in a sitting position, and it's not long after that, Black's laid back down after police find him unresponsive.

In the following few minutes of video, police and medical personnel try to revive Black with CPR and Narcan.

Black was later taken by ambulance to a hospital where he was pronounced dead.

Caroline County State's Attorney Joe Riley says he will not present the case to a grand jury. Black's family attorney, Timothy Maloney, says they will pursue an investigation with the Civil Rights Division of the Department of Justice.