Originally the 3rd overall pick by the Browns in the 2012 draft, Richardson was traded to the Colts for a first round pick just two games into his second season in the NFL.
At this point, the 23-yea-old back has officially been labeled a bust. He has averaged 3.3 yards per carry in his three NFL seasons and has struggled with keeping his weight down throughout that time. He hasn't rushed for over 100 yards in a game since his rookie season.
This is a low risk move for the Raiders. Their running back unit is not settled so Richardson can earn a spot. If he doesn't it isn't a great loss. They have Latavius Murray in place as the starter and signed Roy Helu Jr on the first day of free agency.