Share 'Steve McNair's Mistress -- The DUI Tape 2 Days Before She Murdered Steve McNair'

Sahel Kazemi was busted for DUI two days before she murdered Steve McNair and then committed suicide -- and cops just released dashcam footage of the incident. Sahel was initially pulled over for speeding on July 2, then forced to take field sobriety tests -- which she failed. Cops allowed Steve and another man in the Escalade to leave in a taxi -- but Steve showed up at the jail later on to b…