United States v. Marchado-Erazo
950 F. Supp. 2d 49
D.D.C.2013Background
- Machado-Erazo is charged with RICO conspiracy, VICAR murder, and gun possession in relation to MS-13 activity.
- Government seeks to introduce FBI Special Agent Magnuson’s cell-site analysis to place phones in the area where a body was found.
- Machado-Erazo moves to exclude Magnuson’s testimony as unreliable under Daubert and Rule 702 or as relevant/unduly prejudicial under Rule 403.
- Court previously denied the motion in court; this Opinion expands its reasoning and confirms admissibility.
- Magnuson maps a phone’s location by analyzing call data with 120-degree pie-shaped sectors from a specific tower antenna.
- Courts have admitted similar cell-site analysis; Evans is distinguished, and other jurisdictions (Davis/Jones analogs) support reliability.
Issues
| Issue | Plaintiff's Argument | Defendant's Argument | Held |
|---|---|---|---|
| Is Magnuson’s cell-site analysis reliable under Daubert/Rule 702? | Machado-Erazo contends the method is faulty and not based on reliable data or principles. | Government argues Magnuson’s method is reliable, tested, and widely accepted; qualifies as expert testimony. | Reliable; admissible under Daubert/Rule 702. |
| Is the testimony relevant or unduly prejudicial under Rule 401/403? | Connections of phones to towers do not prove location or guilt; testimony risks prejudice. | Testimony helps prove whether defendants were in the relevant area and is probative of issue in dispute. | Testimony relevant; probative and not unduly prejudicial. |
| Should the court hold a Daubert hearing for Magnuson’s methodology? | A Daubert hearing is necessary due to alleged unreliability. | No Daubert hearing needed; method has been accepted and is well-supported by authorities. | No hearing required; methodology deemed reliable. |
Key Cases Cited
- Daubert v. Merrell Dow Pharmaceuticals, Inc., 509 U.S. 579 (1993) (gatekeeping reliability and relevance of expert testimony)
- Kumho Tire Co. Ltd. v. Carmichael, 526 U.S. 137 (1999) (flexible Daubert standard; trial court discretion)
- Ambrosini v. Labarraque, 101 F.3d 129 (D.C. Cir. 1996) (four-factor Daubert framework; testability, peer review, error rate, acceptance)
- Meister v. Medical Engineering Corp., 267 F.3d 1123 (D.C. Cir. 2001) (Daubert reliability and relevance guidance)
- United States v. Evans, 892 F. Supp. 2d 949 (N.D. Ill. 2012) (cell-site analysis reliability; distinction from granulization theory)