discussed Cited "see" United States v. Vincent Townsend However, this reliability standard “must be rigorously applied.” Beler, 20 F.3d at 1433 ; see U.S.S.G. § 6A1.3(a) (“In resolving any reasonable dispute concerning a factor important to the sentencing determination, the court may consider rele *752 vant information without regard to its admissibility under the rules of evidence applicable at trial, provided that the information has sufficient indicia of reliability to support its probable accuracy.”)- In addition, when aggregating drug quantities to determine whether the evidence establishes that drug transactions are part of the same …