A.G. v. United States

CourtDistrict Court, S.D. California
DecidedSeptember 29, 2025
Docket3:23-cv-00745
StatusUnknown

This text of A.G. v. United States (A.G. v. United States) is published on Counsel Stack Legal Research, covering District Court, S.D. California primary law. Counsel Stack provides free access to over 12 million legal documents including statutes, case law, regulations, and constitutions.

Bluebook
A.G. v. United States, (S.D. Cal. 2025).

Opinion

1 2 3 4 5 6 7 8 UNITED STATES DISTRICT COURT 9 SOUTHERN DISTRICT OF CALIFORNIA 10 11 A.G., a minor child by and through his Case No.: 23-CV-745 JLS (KSC) Guardian Ad Litem, Alfonso Galindo, Jr.; 12 and R.G., a minor child by and through ORDER ON DAUBERT MOTIONS 13 her Guardian Ad Litem, Alfonso Galindo, AND MOTIONS IN LIMINE Jr., 14 Plaintiffs, (ECF Nos. 41, 42, 43, 44) 15 v. 16 UNITED STATES OF AMERICA, 17 Defendant. 18

19 20 Presently before the Court are Plaintiffs A.G.’s and R.G.’s (“Plaintiffs”) and 21 Defendant United States of America’s (“Defendant” or “United States”) Daubert Motions 22 and Motions in Limine (ECF Nos. 41, 42, 43, 44). The Court heard oral argument on 23 September 25, 2025, and thereafter took the Motions under submission. Having carefully 24 considered the Parties’ arguments, the evidence, and the law, the Court rules as follows. 25 / / / 26 / / / 27 / / / 28 / / / 1 BACKGROUND 2 I. Factual Background 3 Plaintiffs are two young siblings who live in a single-family home with their dog, 4 Pupa. ECF No. 1 (“Compl.”) ¶¶ 4–5, 8–9. A gate and an exterior garage door stand side 5 by side in front of Plaintiffs’ home. Id. ¶ 8. The front gate opens to an enclosed patio 6 where Plaintiffs play. Id. Mail carriers need not pass through the front gate into Plaintiffs’ 7 patio to deliver mail, as Plaintiffs’ mailbox sits between the garage door and the exterior 8 side of the gate. Id. ¶¶ 8, 10. During the relevant time period, Plaintiffs’ mail was delivered 9 by United States Postal Service (“USPS”) mail carrier Nestor Medina (“Medina”). Id. ¶ 9. 10 At times, Pupa approached the “interior side of the front gate” when Medina neared 11 Plaintiffs’ home; Pupa would bark at Medina but could not get through the gate. Id. ¶ 10. 12 Plaintiffs allege that on these occasions, Medina used pepper spray on Pupa before reaching 13 Plaintiffs’ mailbox.1 Id. After Pupa retreated, Medina would deliver Plaintiffs’ mail and 14 move on. Id. 15 Plaintiffs allege that Medina repeated the above actions “numerous” times. Id. After 16 each occasion, pepper spray residue lingered in Pupa’s fur. Id. ¶ 11. Plaintiffs, who spent 17 significant time with Pupa every day, allege that they ended up “touch[ing] and breath[ing] 18 in” the residual chemicals. Id. These episodes began in the summer of 2018. Id. ¶ 9. 19 Around the same time, Plaintiffs both developed symptoms of respiratory illnesses, 20 including shortness of breath and coughs. Id. ¶ 12. Multiple medical appointments failed 21 to uncover the cause of Plaintiffs’ symptoms. Id. Plaintiffs allege that Medina continued 22 pepper spraying Pupa until February 2019, when Plaintiffs’ family caught him in the act 23 on a home surveillance video. Id. ¶ 13. Medina stopped delivering Plaintiffs’ mail after 24 his behavior was reported to the USPS. Id. ¶ 14. 25 / / / 26 27 28 1 At the September 25, 2025, hearing, Defendant stated its position is that Medina never pepper-sprayed 1 II. Procedural Background 2 Plaintiffs initiated this action on April 21, 2023. See Compl. Plaintiffs asserted one 3 claim for negligence against the United States and USPS pursuant to the Federal Tort 4 Claims Act (“FTCA”). See generally id. On October 30, 2023, the Court granted in part 5 and denied in part Defendant’s Motion to Dismiss. See ECF No. 10. Specifically, the 6 Court (1) denied Defendant’s motion for lack of subject matter jurisdiction; (2) denied 7 Defendant’s motion for failure to state a claim; (3) granted Defendant’s motion to dismiss 8 USPS as a defendant in the action; and (4) granted Defendant’s motion to dismiss 9 Plaintiffs’ prayers for prejudgment interest and costs incurred in the suit. Id. at 29–30. 10 Following discovery, the Parties filed the present motions. On July 24, 2024, 11 Defendant filed a Motion to Exclude Purported Expert Testimony of James I. Dudley 12 (“Dudley Mot.,” ECF No. 41) and a Motion to Exclude Purported Expert Testimony of Dr. 13 Sean S. Kohles (“Kohles Mot.,” ECF No. 42). On the same day, Plaintiffs filed a Motion 14 in Limine to Exclude Report and Testimony of Dr. Daniel Lesser (“Lesser Mot.,” ECF No. 15 43) and a Motion in Limine to Exclude Children’s Deposition Testimony (“Dep. Mot.,” 16 ECF No. 44). The Parties filed their respective responses on August 28, 2025. See ECF 17 No. 47 (“Dudley Opp’n”); ECF No. 46 (“Kohles Non-Opp’n”); ECF No. 45 (“Lesser 18 Resp.”); ECF No. 49 (“Dep. Opp’n”). On September 4, 2025, Defendant filed replies in 19 support of its motions. See ECF No. 51 (“Dudley Reply”); ECF No. 52 (“Kohles Reply”). 20 Also on September 4, 2024, Plaintiffs filed a reply in support of their Motion in Limine to 21 Exclude Children’s Deposition Testimony. See ECF No. 53 (“Dep. Reply”). Plaintiffs did 22 not file a reply in support of their Motion in Limine to Exclude Report and Testimony of 23 Dr. Daniel Lesser. See generally Docket. 24 LEGAL STANDARDS 25 I. Admissibility of Expert Testimony 26 The standard for expert testimony relevant here is set forth in Federal Rule of 27 Evidence (“Rule”) 702, as interpreted by Daubert v. Merrell Dow Pharms., Inc., 509 U.S. 28 579 (1993), and its progeny. Rule 702 provides that: 1 A witness who is qualified as an expert by knowledge, skill, experience, training, or education may testify in the form of an 2 opinion or otherwise if the proponent demonstrates to the court 3 that it is more likely than not that: (a) the expert’s scientific, technical, or other specialized 4 knowledge will help the trier of fact to understand the 5 evidence or to determine a fact in issue; (b) the testimony is based on sufficient facts or data; 6 (c) the testimony is the product of reliable principles and 7 methods; and (d) the expert’s opinion reflects a reliable application of 8 the principles and methods to the facts of the case. 9 Fed. R. Evid. 702. Daubert and subsequent cases have interpreted Rule 702 as 10 requiring that evidence be both relevant and reliable. 509 U.S. at 589–95. As the 11 Ninth Circuit explained: 12 Under Daubert and its progeny, including Daubert II [Daubert v. 13 Merrell Dow Pharms., Inc., 43 F.3d 1311 (9th Cir.1995)], a district court’s inquiry into admissibility is a flexible one. Alaska 14 Rent-A-Car, Inc. v. Avis Budget Grp., Inc., 738 F.3d 960, 969 15 (9th Cir. 2013). In evaluating proffered expert testimony, the trial court is “a gatekeeper, not a fact finder.” Primiano v. Cook, 598 16 F.3d 558, 565 (9th Cir. 2010) (citation and quotation marks 17 omitted). “[T]he trial court must assure that the expert testimony ‘both rests on a reliable foundation and is relevant to the task at 18 hand.’” Id. at 564 (quoting Daubert, 509 U.S. at 597[]). “Expert 19 opinion testimony is relevant if the knowledge underlying it has a valid connection to the pertinent inquiry. And it is reliable if 20 the knowledge underlying it has a reliable basis in the knowledge 21 and experience of the relevant discipline.” Id. at 565 (citation and internal quotation marks omitted). “Shaky but admissible 22 evidence is to be attacked by cross examination, contrary 23 evidence, and attention to the burden of proof, not exclusion.” Id. at 564 (citation omitted). The judge is “supposed 24 to screen the jury from unreliable nonsense opinions, but not 25 exclude opinions merely because they are impeachable.” Alaska Rent-A-Car, 738 F.3d at 969. Simply put, “[t]he district court is 26 not tasked with deciding whether the expert is right or wrong, 27 just whether his testimony has substance such that it would be helpful to a jury.” Id. at 969–70. 28 1 City of Pomona v. SQM N. Am. Corp., 750 F.3d 1036, 1043–44 (9th Cir. 2014).

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A.G. v. United States, Counsel Stack Legal Research, https://law.counselstack.com/opinion/ag-v-united-states-casd-2025.