Simpson signed a two-year contract with the 49ers on Thursday. Arguably known for his legal issues more so than his play on the field, Simpson was released by the Vikings in September while serving a three-game suspension to open the 2014 season. The suspension was for a November 2013 DUI arrest, and his release was prompted by a July arrest for violating a limited driver's license, marijuana possession and open bottle. It's unclear whether the 29-year-old wide receiver will receive further discipline from the NFL, but either way, he'll likely have to compete for a roster spot in training camp.