Johnson v. State
179 A.3d 984
Md.2018Background
- Martaz Johnson, an MTA police officer, was tried for sexual offenses after a woman (Ms. K) alleged he drove her home following a bus accident and then assaulted and raped her. Forensic testing recovered the victim’s skin cells on Johnson.
- Johnson carried an MTA-issued “Pocket Cop” cell phone with GPS and the agency uses Field Force Manager to generate location reports from those devices.
- At trial the State elicited two entries from the Pocket Cop report via an MTA supervisor (Sergeant Schauman): one showing Johnson near the friend’s address for 14 minutes and another showing him near the victim’s residence for 37 minutes. The full report was not admitted into evidence; only selected entries were read aloud.
- Defense objected on grounds of foundation, hearsay/business-records, completeness (a gap in the record), and that the sponsoring witness lacked technical expertise and was being used as a quasi-expert. The court found the report was kept in the ordinary course of business and admitted the specific entries; defense cross-examined the witness about technical limits.
- The Court of Special Appeals affirmed; Johnson petitioned to the Maryland Court of Appeals on whether GPS-derived location/duration data required expert foundation testimony for admission.
Issues
| Issue | Plaintiff's Argument (Johnson) | Defendant's Argument (State) | Held |
|---|---|---|---|
| Whether GPS location/duration data from a Pocket Cop must be admitted through an expert foundation | GPS data is technical; the sponsoring lay witness lacked expertise to authenticate/interpret GPS output and expert testimony was required | GPS entries are plain (addresses/times/durations), admitable as business records and intelligible to jurors without expert explanation; defects go to weight | Held: No categorical expert prerequisite. GPS location/time entries in a business record may be admitted through a lay witness without expert testimony where entries are decipherable by jurors; trial court did not err in admitting the redacted entries via the custodian. |
| Whether defense preserved objection that expert testimony was required | Defense argued foundation, hearsay/authenticity, and pointed to witness’ lack of technical knowledge; did not clearly frame a rule-based expert-objection at trial | State argued objection focused on business-record foundation and thus issue not preserved | Held: Preservation was close; Court addressed the issue as important and appropriate to resolve despite ambiguous preservation. |
| Whether Payne (cell-tower evidence) controls and requires experts for location testimony | Payne compels expert testimony because cell records are technical and require translation | GPS entries here are straightforward street addresses/times and used for the same purpose as in business practice | Held: Payne is distinguishable — cell-tower analysis involved translating technical codes and inferring communication paths; GPS report entries here were plain and not similarly technical. |
| Admissibility under business-records hearsay exception when full report not admitted | Partial reading of a non-admitted report by lay witness risked admitting hearsay without foundation or personal knowledge | Business-record foundation can be supplied by a records custodian; selective reading of relevant entries is permissible and defects affect weight | Held: Court affirmed that selective oral presentation of admissible business-record entries is within trial court discretion; formal admission of the whole report not required where redaction or oral presentation avoids irrelevant material. |
Key Cases Cited
- United States v. Jones, 565 U.S. 400 (2012) (recognizing GPS-enabled devices’ capacity to provide fine-grained location information)
- State v. Payne, 440 Md. 680 (2014) (cell-site record analysis requiring expert because records needed technical translation and inference)
- Gross v. State, 229 Md. App. 24 (2016) (GPS tracking records admitted via non-technical company witness who read plain time/address entries)
- Ragland v. State, 385 Md. 706 (2005) (if foundation for testimony requires specialized knowledge, expert qualification is required)