Kansas City Chiefs cornerback Sean Smith has been suspended for three games by the NFL for violating the substance-abuse policy. Smith pleaded guilty to driving under the influence charge charge in April and was assigned to two years of probation. Under the NFL substance-abuse policy, two-game suspensions are given for a first offense. If there's aggravating circumstances, though, as Smith was involved in where he struck and broke a light pole, the policy can increase the punishment. Follow me on Twitter: @RavensInsider Aaron Wilson covers the Ravens for The Baltimore Sun