Sentencing guidelines with respect to robbery against a postal employee

Not later than May 1 following the first year that begins after the date of enactment of this Act, the United States Sentencing Commission shall amend the sentencing guidelines and policy statements promulgated under section 994 of title 28, United States Code, to provide that the assault or robbery of a postal employee, including conduct committed during the immediate flight after the commission of such an assault or robbery if the conduct creates a substantial risk of serious bodily injury, shall be treated in the same manner as the assault of a law enforcement officer.