Background
Zeth Phillips, an inmate at Centennial Correctional Facility, was placed in administrative detention and brought to the intake center for processing. Sergeant Robert Morris informed Phillips that a routine strip search would be conducted to ensure no contraband was smuggled. When Phillips refused to comply—despite having no right to do so—officers conducted what CCF termed a “noncompliant strip search,” placing him on the ground, cutting off his clothes, and using force techniques for visual inspection. During the search, Phillips spat at the officers multiple times, including directly on Sergeant Morris’ face. To compel compliance, the officers applied pressure to Phillips’ neck. Body camera footage captured the entire incident.
The prosecution charged Phillips with second degree assault by bodily fluid on a detention center employee under Colorado Revised Statutes § 18-3-203(1)(f.5)(I). At trial, the jury viewed the body camera footage and heard testimony from Morris, Officer Tony Che, and Correctional Officer Tamara Gold, who reviewed the footage. Through his counsel, Phillips argued the officers had applied an unlawful “chokehold”—specifically targeting the hypoglossal pressure point, which Colorado law prohibits for law enforcement—and that he spat in self-defense. The jury convicted Phillips as charged, and the trial court sentenced him to four years in the Department of Corrections’ custody, running concurrently with his existing sentence.
The Court’s Holding
The Colorado Court of Appeals affirmed Phillips’ conviction, addressing three separate challenges. On the expert testimony issue, the court agreed with Phillips that Morris, Che, and Gold had offered expert testimony disguised as lay opinion. When Morris and Che explained specialized pressure point techniques—including the location of the mandibular angle nerve and why their technique did not impede the windpipe or carotid arteries—and when Gold opined that the tactics used were not a chokehold, they were relying on specialized knowledge from defensive tactics training that ordinary citizens would not possess. The trial court should have formally qualified all three as expert witnesses. However, the court found this error was neither obvious nor substantial. The error was not obvious because Colorado courts have acknowledged that distinguishing lay from expert testimony in law enforcement contexts generates “equal measures of confusion and controversy.” Moreover, the error was not substantial because the jury viewed the body camera footage and could independently assess what the video showed, regardless of the officers’ characterizations. The record also showed sufficient background existed to qualify the witnesses as experts, meaning the jury would have heard the testimony in any case.
Regarding the challenge that Gold’s testimony usurped the jury’s role as fact finder, the court disagreed. Although an expert may testify on ultimate issues, the testimony must not usurp the jury’s function. Gold’s opinion that the strip search was conducted “in line with procedure and in a professional manner” was an assessment of whether the officers complied with CCF policy—not whether they complied with applicable law. Critically, Gold never opined that Phillips committed assault; she assessed only the officers’ actions. The trial court also instructed the jury it could believe all, part, or none of any witness’s testimony. Under these circumstances, no usurpation occurred.
On the limiting instruction issue, the court held the trial court properly refused to sua sponte provide an instruction directing jurors to disregard Phillips’ prior conviction. The statute defining second degree assault by bodily fluid requires proof that the defendant was “lawfully confined in a detention facility.” Phillips’ prior conviction and resulting incarceration are therefore “intrinsic evidence”—evidence inherent to proving an element of the charged crime itself, not extraneous “other crimes” evidence. Because intrinsic evidence does not trigger Colorado Rule of Evidence 404(b) restrictions on character evidence, no limiting instruction was required. The prosecution never even mentioned the reason for Phillips’ confinement, referring to him only as an “offender” at the facility.
Key Takeaways
- Specialized knowledge of force techniques and anatomy constitutes expert testimony, even if presented through law enforcement witnesses without formal expert qualification; omitting qualification may be error but is not automatically reversible when corroborating video evidence allows the jury to reach independent conclusions.
- A trial court has no duty to sua sponte provide a limiting instruction regarding a defendant’s prior conviction when that conviction is intrinsic evidence—i.e., when the prior crime or its consequences are elements of the charged offense itself.
- Expert testimony that assesses compliance with institutional policy, rather than opining on whether the defendant committed the charged crime, does not usurp the jury’s role as fact finder.
- Body camera footage played a decisive mitigating role in the appellate analysis, allowing the court to conclude the jury could evaluate contested conduct independently of officer testimony.
Why It Matters
This decision clarifies evidentiary standards in cases involving law enforcement and detention facility procedures. It confirms that specialized knowledge about defensive tactics and anatomy ordinarily requires expert qualification and procedures, yet permits conviction to stand where video documentation allows jurors to bypass witness characterization. The ruling also has broader implications for criminal procedure: it establishes that a defendant’s status (such as incarceration) is intrinsic to crimes that require proof of that status, and therefore is not subject to evidence rules designed to prevent character-based convictions. This eliminates a potential avenue for appeal in cases where defendants argue their prior criminal history improperly influenced the jury.
The decision also reinforces courts’ increasing reliance on video evidence to cure evidentiary errors at trial. By allowing convictions to stand when footage is available for jury review, the ruling reflects judicial confidence that juries can assess credibility and reconstruct events from raw video—potentially reducing the need for curative jury instructions or formal qualification of witnesses in an era of greater technology use in law enforcement.