Did the court of appeals err in holding that the district court's guidelines calculations did not constitute clear error where it denied a mitigating role adjustment to a conspirator who engaged in only one transaction of three kilograms of methamphetamine-in which he merely introduced the buyer and seller?

QUESTION PRESENTED A district court’s guidelines calculations are reviewed for clear error. Did the court of appeals err in holding that the district court’s guidelines calculations did not constitute clear error where it denied a mitigating role adjustment to a conspirator who engaged in only one transaction of three kilograms of methamphetamine-in which he merely introduced the buyer and seller?