251 A.3d 102
Del.2021Background
- Late-night traffic stop after officers observed a Chevrolet Malibu drift across the fog line multiple times; officers were conducting traffic enforcement.
- Officer Radcliffe testified at the suppression hearing that, when the driver Naifece Houston opened his window, he smelled a "slight chemical" odor he associated with cocaine based on extensive field experience.
- Houston was removed, appeared likely to flee, and ultimately ran; officers chased, subdued, and arrested him. The vehicle was towed and an inventory search produced ~133 grams of confirmed cocaine.
- Houston moved to suppress the cocaine (and phone evidence, later mooted), requesting a Daubert hearing to challenge the admissibility of Radcliffe’s odor-based testimony as expert opinion.
- The Superior Court allowed the officer’s odor testimony (viewing it as lay opinion or otherwise admissible for suppression purposes), denied suppression, and convicted Houston after a stipulated bench trial. Houston appealed.
- The Delaware Supreme Court affirmed, holding the trial court did not abuse its discretion and that Daubert gatekeeping was not required at a suppression hearing evaluating reasonable suspicion/probable cause.
Issues
| Issue | Plaintiff's Argument (Houston) | Defendant's Argument (State) | Held |
|---|---|---|---|
| Whether the officer’s testimony that he detected an odor associated with cocaine was expert opinion requiring a Daubert hearing | Radcliffe’s identification was based on training/experience and thus "expert" under D.R.E. 702 and Daubert; a hearing was required | The testimony was admissible lay opinion under D.R.E. 701 and/or otherwise properly considered at a suppression hearing without Daubert | Court: Daubert gatekeeping not required at suppression; trial court did not abuse discretion in considering the testimony as sufficiently reliable for reasonable-suspicion analysis |
| Whether the odor detection supplied independent reasonable suspicion to extend/detain beyond the traffic stop’s original scope | Without the odor testimony, police lacked independent facts to extend the stop; admission of the odor evidence was outcome-determinative | Odor detection, plus the stop facts and Houston’s furtive/nervous behavior and flight, supplied reasonable suspicion; factual findings show the stop unfolded in an orderly, fast-moving sequence | Court: factual findings supported denial of suppression; even if scope/pace were questioned, consideration of the odor was proper and the detention was not unlawfully extended |
| Whether suppression hearings must apply trial evidentiary standards (including exclusion of testimony that would need Daubert at trial) | Suppression court should not rely on testimony that would be excluded at trial absent proper Daubert scrutiny | Suppression hearings may consider evidence (including hearsay or experience-based observations) that would be inadmissible at trial; relaxed standards apply | Court: Suppression hearings use relaxed evidentiary standards; Daubert’s strictures are not required for reliability determinations at suppression; discretion rests with trial judge |
Key Cases Cited
- Daubert v. Merrell Dow Pharm., 509 U.S. 579 (1993) (federal standard for admissibility of expert scientific testimony)
- Brinegar v. United States, 338 U.S. 160 (1949) (distinguishing standards for probable cause from proof of guilt at trial)
- United States v. Matlock, 415 U.S. 164 (1974) (rules of evidence do not operate with full force at suppression hearings)
- United States v. Raddatz, 447 U.S. 667 (1980) (suppression hearings may rely on hearsay and other evidence inadmissible at trial)
- Johnson v. United States, 333 U.S. 10 (1948) (odor evidence can be sufficient to establish probable cause if magistrate finds affiant qualified to know the odor)
- Caldwell v. State, 780 A.2d 1037 (Del. 2001) (framework for when a traffic stop becomes a separate seizure requiring independent reasonable suspicion)
- Seward v. State, 723 A.2d 365 (Del. 1999) (police cannot testify at trial as lay witnesses that a substance is cocaine when that identification requires expert qualification)
- Norman v. State, 968 A.2d 27 (Del. 2009) (police officers should not identify seized substances as drugs at trial without proper expert foundation)