Black PhD student is beaten and cuffed by police

'This is my vehicle, sir': Shocking moment black Northwestern University PhD student is beaten and cuffed when cops refuse to believe he owns the Chevy he's driving
Lawrence Crosby, then 25, was arrested in Evanston, Chicago in October 2015
He is suing Evanston Police Department for excessive force over the ordeal
Authorities released dashboard video this week of moment he was arrested
It shows him being tackled to the ground after telling officers he owned the car