Title VII Retaliation Causation Requires Knowledge: Decisionmaker or Cat’s Paw Actor Must Know of Protected Activity; Pretext Alone Cannot Supply the Missing Link

Case: Dominguez v. Weiser Security Services, Inc. (10th Cir. Apr. 7, 2026)  |  Court: United States Court of Appeals for the Tenth Circuit

1. Introduction

Dominguez v. Weiser Security Services, Inc. is a causation-focused Title VII retaliation decision arising from a workplace dispute during the early COVID-19 pandemic. Juan Dominguez, a security guard supervisor at a Halliburton site in Duncan, Oklahoma, was terminated in June 2020. Weiser Security Services, Inc. attributed the termination to COVID-related protocol issues, training failures for newly implemented temperature checks, attitude/performance concerns, and an alleged failure to attend a weekend training session.

Dominguez claimed retaliation under Title VII, contending that shortly before he was fired he reported alleged sex-based favoritism by his supervisor, Joseph Yates, to Weiser’s Vice President of Human Relations, Charlene Lee-Sutherlin, during an on-site investigation that was initiated by another employee’s race-discrimination complaint.

The central issue on appeal was narrow but outcome-determinative: whether Dominguez produced enough evidence of a causal nexus—specifically, evidence that the relevant actor(s) knew of Dominguez’s protected activity—so as to survive summary judgment under the McDonnell Douglas framework.

2. Summary of the Opinion

The Tenth Circuit affirmed summary judgment for Weiser. The court reiterated and applied a strict knowledge-based causation requirement for retaliation claims: Dominguez had to show either (a) the decisionmaker who fired him knew of his protected activity, or (b) under a cat’s paw theory, a subordinate with retaliatory animus knew of the protected activity and used the decisionmaker to effect the termination.

On the record presented, Dominguez showed neither:

• No direct retaliation causation: the undisputed decisionmaker, branch manager Mike Strickland, lacked knowledge of Dominguez’s sex-discrimination report to HR.
• No cat’s paw causation: Dominguez failed to produce evidence that Yates knew Dominguez made the sex-discrimination report to Lee-Sutherlin on June 10.

The court further held that even if Dominguez had evidence suggesting some of Weiser’s proffered reasons were pretextual, pretext cannot substitute for the threshold showing of knowledge necessary to infer retaliatory “but-for” causation.

3. Analysis

3.1 Precedents Cited

A. Summary judgment and evidentiary sufficiency

• Cillo v. City of Greenwood Vill., 739 F.3d 451, 461 (10th Cir. 2013) and Tabor v. Hilti, Inc., 703 F.3d 1206, 1215 (10th Cir. 2013): framed the de novo review standard and the obligation to draw reasonable inferences for the nonmovant—while still requiring a genuine dispute of material fact.
• Cardoso v. Calbone, 490 F.3d 1194, 1197 (10th Cir. 2007) (quoting Sealock v. Colorado, 218 F.3d 1205, 1209 (10th Cir. 2000)): emphasized the nonmovant’s duty to “go beyond the pleadings” and designate specific facts establishing an essential element.
• Champagne Metals v. Ken-Mac Metals, Inc., 458 F.3d 1073, 1084 (10th Cir. 2006) (quoting Matsushita Elec. Indus. Co. v. Zenith Radio Corp., 475 U.S. 574, 586 (1986)): rejected “metaphysical doubt” as a substitute for evidence.
• Simpson v. Univ. of Colo. Boulder, 500 F.3d 1170, 1179 (10th Cir. 2007): captured the dispositive inquiry—whether the evidence is sufficiently disputed to require a jury.

B. Knowledge as a prerequisite to retaliation causation

• Singh v. Cordle, 936 F.3d 1022, 1043 (10th Cir. 2019) (citing Hinds v. Sprint/United Mgmt. Co., 523 F.3d 1187, 1203 (10th Cir. 2008)): supplied the key intermediate step: to infer retaliatory motive, the plaintiff must first produce evidence that the decisionmaker knew of the protected activity.
• Lindsay v. Denver Pub. Schs., 88 F.4th 1323, 1328-29 (10th Cir. 2023): directly powered the court’s rejection of “opportunity to know” reasoning. The panel invoked Lindsay to hold that speculation about what was communicated inside the organization is not enough; “bare speculation” cannot defeat summary judgment.
• Martin v. Fin. Asset Mgmt. Sys., Inc., 959 F.3d 1048, 1054 (11th Cir. 2020): quoted via Lindsay v. Denver Pub. Schs. for the proposition that a supervisor’s opportunity to tell the decisionmaker is not evidence that he did.

C. Pretext’s limited role at the prima facie stage

• Adamson v. Multi Cmty. Diversified Servs., Inc., 514 F.3d 1136, 1144 (10th Cir. 2008) (citing Mickelson v. N.Y. Life Ins. Co., 460 F.3d 1304, 1317 (10th Cir. 2006)): recognized that pretext evidence can sometimes inform the prima facie inquiry, but warned against conflating doubts about an employer’s stated reason with proof of unlawful animus. In Dominguez, Adamson was decisive: without knowledge, pretext does not establish retaliation as the “but-for” reason.

D. Cat’s paw liability doctrine

• Byrnes v. St. Catherine Hosp., 158 F.4th 1107, 1114 (10th Cir. 2025): provided the modern Tenth Circuit articulation of cat’s paw and its elements (animus, intent to cause the adverse action, but-for causation). The Dominguez court applied Byrnes but found the theory failed at the threshold: no evidence the alleged biased subordinate knew of the protected activity.
• EEOC v. BCI Coca-Cola Bottling Co. of L.A., 450 F.3d 476, 484-86 (10th Cir. 2006): cited (through Byrnes) as foundational Tenth Circuit authority for imputing a subordinate’s bias to an otherwise unbiased final decisionmaker.
• Staub v. Proctor Hosp., 562 U.S. 411, 415 n.1 (2011) and Shager v. Upjohn Co., 913 F.2d 398, 405 (7th Cir. 1990): supplied historical and conceptual framing of the “cat’s paw” label and its entry into employment discrimination law.

E. Appellate preservation / underdeveloped arguments

• Utah Animal Rts. Coal. v. Salt Lake Cnty., 566 F.3d 1236, 1244 (10th Cir. 2009): used to decline consideration of a late/underdeveloped argument that Yates was the final decisionmaker because he signed the termination form.

3.2 Legal Reasoning

A. The court’s causal model: knowledge as the “bridge”

The opinion conceptualizes retaliation causation as a broken chain unless knowledge connects protected activity to the adverse action. That approach is explicit in its opening statement of the governing rule (from Montes v. Vail Clinic, Inc.): either the decisionmaker must know, or a biased subordinate who knows must manipulate the decision.

Practical effect: proof of “something unfair happened” (or even “the employer’s reasons look dubious”) is not enough. The plaintiff must be able to tie the unfairness to protected activity through evidence that the relevant actor had awareness of that activity.

B. Direct retaliation theory: Strickland’s lack of knowledge ends the claim

Under Singh v. Cordle and Hinds v. Sprint/United Mgmt. Co., knowledge is a prerequisite: without evidence Strickland knew Dominguez reported sex discrimination to Lee-Sutherlin, a jury cannot rationally infer the termination was motivated by retaliation for that report.

The record, as the panel described it, was affirmatively negative: Strickland denied knowledge; Lee-Sutherlin denied telling him; and Dominguez denied telling anyone else. Dominguez therefore relied on inference—essentially, that because HR was onsite and interviewed him, Strickland must have known what was said. The panel treated that as impermissible speculation under Lindsay v. Denver Pub. Schs..

C. Why “pretext” did not save the claim

Dominguez emphasized evidence suggesting at least one reason (his supposed failure to attend Saturday training) was fabricated. The court accepted that this could undermine Weiser’s narrative, but it refused to let pretext substitute for the missing knowledge element. Drawing on Adamson v. Multi Cmty. Diversified Servs., Inc., the panel reasoned:

• Pretext suggests the employer’s stated reasons may not be the real reasons.
• But without knowledge of protected activity, retaliation cannot be the “real” (and “but-for”) reason.
• Thus pretext evidence, standing alone, cannot establish causation.

This is a significant clarifying move: it confines pretext’s inferential power when the plaintiff cannot first show the actor could retaliate for the protected activity (because the actor did not know it occurred).

D. Cat’s paw theory: no proof Yates knew of the June 10 sex-discrimination report

The panel applied the Byrnes v. St. Catherine Hosp. elements and agreed with the district court that Dominguez’s theory failed at element one (retaliatory animus tied to protected activity), because Dominguez did not show Yates knew about the June 10 report.

Dominguez offered three main inferential routes, each rejected as too speculative:

• Pre-investigation “threat” conversation: Yates allegedly said weeks earlier he knew “complaints about gender treatment had been made.” The court held this did not show knowledge of the specific June 10 report to HR—especially since the HR investigation was initiated by a race-discrimination complaint and Yates purportedly did not learn he was being investigated until June 11.
• June 10 angry training call: Dominguez argued Yates’s anger “could” reflect anger about Dominguez being interviewed. The court found the call aligned with contemporaneous training pressures and contained no evidence linking it to the sex-discrimination report.
• Alleged fabrication about Saturday training attendance: even if it showed some improper motive, the court reasoned it could reflect “mere dislike” or blame-shifting, and without knowledge it could not be attributed to retaliation for protected activity.

In short, the cat’s paw pathway was blocked by the same structural requirement as direct causation: knowledge of protected activity is the gateway fact.

3.3 Impact

The decision’s practical impact is to tighten (or at least make more explicit) the evidentiary discipline around Title VII retaliation causation in the Tenth Circuit:

• Knowledge is not optional: plaintiffs must develop record evidence of who knew what, when—especially where HR interviews occur but are confidential in content.
• “Opportunity to know” is not evidence of knowledge: internal communications and proximity in time may be insufficient without concrete proof of transmission, consistent with Lindsay v. Denver Pub. Schs..
• Pretext is bounded: evidence that the employer’s story is shaky cannot, by itself, carry the “but-for retaliation” inference if the decisionmaker (and the alleged manipulator) did not know of the protected activity.
• Cat’s paw claims require careful proof of the subordinate’s awareness: Dominguez underscores that animus cannot be inferred from hostility alone; it must be tied to the protected act the plaintiff says triggered retaliation.

For litigants, the case signals the importance of targeted discovery: depositions or documents showing whether HR conveyed allegations to managers, whether accused supervisors were informed of specific complaints, and whether decisionmakers received any summary of protected reports.

4. Complex Concepts Simplified

• Protected activity: actions Title VII protects from retaliation, such as opposing unlawful discrimination or participating in a Title VII investigation.
• Adverse employment action: a materially harmful action (here, termination) that would matter to a reasonable employee.
• Causation / causal nexus: a connection showing the adverse action happened because of the protected activity. In this opinion, causation requires proof the relevant actor knew about the protected activity.
• McDonnell Douglas framework: a burden-shifting method used when there is no direct evidence. At the first step (prima facie case), the plaintiff must produce evidence of protected activity, adverse action, and causation.
• Pretext: evidence the employer’s stated reason may be false. Dominguez clarifies that pretext alone does not establish retaliation if the plaintiff cannot first show the decisionmaker (or cat’s paw actor) knew of the protected activity.
• Cat’s paw theory: when a biased subordinate (who has the unlawful motive) manipulates an otherwise unbiased decisionmaker into taking an adverse action. This opinion stresses that the biased subordinate must know of the protected activity for retaliation liability to attach.

5. Conclusion

Dominguez v. Weiser Security Services, Inc. reinforces a crisp, proof-driven rule for Title VII retaliation claims: causation requires evidence that the termination decisionmaker knew of the protected activity, or that a subordinate who knew of it engineered the decision under a cat’s paw theory. The court’s additional clarification—that pretext evidence cannot fill the gap where knowledge is missing—makes the decision a pointed reminder that retaliation claims turn not only on suspicious timing or disputed workplace criticisms, but on demonstrable informational links connecting the protected report to the adverse action.