Tyrone Harris, 18, was shot by police on Sunday and is in critical condition. He has been charged with four counts of assault on law enforcement, among other things.
People blocked Interstate 70 during ongoing demonstrations to mark the one-year anniversary of the death of Michael Brown Jr. in Ferguson, Missouri on Monday.
About 50 people reportedly were taken into custody outside the St. Louis federal courthouse.
Michael Slager allegedly tased another unarmed black man in 2013 without proper cause.
According to video evidence, the officer, Michael Thomas Slager, shot Scott in the back on Saturday.
Staffers in Washington DC joined the protests over police killings of two black men