M. B. v. City and County of San Francisco, et al.

District Court, N.D. California·Decided June 29, 2026·No. 3:24-cv-00301·Unknown

Opinion

UNITED STATES DISTRICT COURT NORTHERN DISTRICT OF CALIFORNIA

M. B., Case No. 24-cv-00301-RFL

Plaintiff, ORDER RE MOTIONS FOR v. SUMMARY JUDGMENT

CITY AND COUNTY OF SAN Re: Dkt. Nos. 110, 113 FRANCISCO, et al., Defendants.

I. INTRODUCTION Plaintiff M.B., a twenty-year-old formerly under the jurisdiction of the San Francisco Juvenile Court and confined in San Francisco Juvenile Hall (“SFJH”), filed suit against Defendants City and County of San Francisco, Bryan Thomasson, and other employees of the City, County, and the San Francisco Juvenile Probation Department. M.B. alleges that from December 21, 2022, to December 24, 2022, Defendants held him in solitary confinement for a total of three days in violation of his rights under both federal and state law. (Dkt. No. 18.) Both parties move for summary judgment. (Dkt. Nos. 110, 113.) For the reasons that follow, M.B.’s motion is DENIED, and Defendants’ motion is GRANTED IN PART AND DENIED IN PART. II. BACKGROUND A. Undisputed Facts M.B. was transferred to SFJH from San Mateo Juvenile Hall in Spring 2022, having previously been adjudicated delinquent and sentenced to four years of confinement in 2020. (Dkt. No. 113-3 (“M.B. Dep.”) at 69:12–76:3.)1 On December 21, 2022, Defendants received an anonymous tip that M.B. was in possession of a cell phone, pills, a laptop, and other items that constituted major contraband. (Dkt. No. 113-6 (“Johnson Dep.”) at 30:7–31:12; see also Dkt. No. 113-4 (“Thomasson Dep.”) at 47:9–25.) At around 1:30pm, Defendants Thomasson and SFJH Deputy Probation Officer Nigel Hicks searched M.B.’s room and found a cell phone, adapters, a portable charger, and several charging cords. (Thomasson Dep. at 41:7-43:1.) This triggered a unit-wide search of every detainee’s room and all common areas. (Id. at 59:2–11.) M.B. was moved to a different room in his unit and placed in room confinement beginning at 3:00pm on December 21. (Id. at 40:4–6, 55:7–56:13.) While in room confinement, M.B. was provided with about an hour of recreation time, during which he had access to shower facilities, the telephone, visitation, and the gym. (See M.B. Dep. at 233:20–235:22; 262:1–25; Johnson Dep. at 67:21–71:14.) He remained in room confinement until December 24, 2022, at around 11:00am. (Thomasson Dep. at 120:1–21; see also Dkt. No. 113-20 at 12.) M.B. submitted two grievances concerning this confinement. First, during his confinement, M.B. filed a grievance stating that he was beginning to feel depressed and experience mental health issues because he had been in room confinement for days. (Dkt. No. 18 at 90.) He admitted he had contraband in his room but asserted that he was “not a threat to [himself] or others,” there was no reason for him to be “lock[ed] down like a[n] animal,” and he believed his confinement was a violation of his rights. (Id. at 89.) In a “[g]rievance attachment,” M.B. “restate[d] that [his] rights [had been] violated” by his room confinement, explaining that he was “unlawfully held in solitary confinement,” “held in isolation against [his] will,” and “denied [his] rights to programming and exercise.” (Id. at 92.) He indicated that he was seeking both damages for the harms he experienced and “a change in policies and practices so that [SFJH] do[es] not violate [his] rights or the rights of other youth in the future.” (Id.) Second, in June 2023, M.B. submitted a tort claim to the City and County. (Dkt. No. 113-10.) The claim

1 For filings on the docket besides depositions, all references to page numbers refer to ECF pagination. asserted that M.B.’s room confinement violated state law and regulations (including California Welfare & Institutions Code section 208.3), the San Francisco Juvenile Probation Department’s own written policies, and the California and federal constitutions. (Id. at 4–5.) M.B. was released from SFJH in June 2025. (M.B. Dep. at 13:8–15.) B. This Action M.B. filed the operative Second Amended Complaint on April 30, 2024. (Dkt. No. 18.) Defendants moved to dismiss (Dkt. No. 22), and the Court granted the motion in part and denied the motion in part, giving M.B. leave to amend several of his claims (Dkt. No. 34). M.B. did not amend his complaint. The case therefore proceeded on the following claims: the Monell claim, the supervisory liability claim, the Fourth Amendment claim, the Eighth Amendment claim, the Fourteenth Amendment claim, the Bane Act claim, and the negligence claim. M.B. moves for summary judgment on the Bane Act, Monell, and supervisory liability claims. (See Dkt. No. 110.) Defendants move for summary judgment on all claims and M.B.’s request for declaratory and injunctive relief, and punitive damages. (See Dkt. No. 113.) III. LEGAL STANDARD “[W]hen parties submit cross-motions for summary judgment, each motion must be considered on its own merits.” Fair Hous. Council of Riverside Cnty., Inc. v. Riverside Two, 249 F.3d 1132, 1136 (9th Cir. 2001) (cleaned up). Under Federal Rule of Civil Procedure 56, summary judgment is appropriate if the moving party “shows that there is no genuine dispute as to any material fact” and that they are “entitled to judgment as a matter of law.” Fed. R. Civ. P. 56(a). A genuine dispute of fact exists if “the evidence is such that a reasonable jury could return a verdict for the nonmoving party.” Anderson v. Liberty Lobby, Inc., 477 U.S. 242, 248 (1986). The Court draws all reasonable inferences in favor of the non-movant, keeping in mind that “[c]redibility determinations, the weighing of the evidence, and the drawing of legitimate inferences from the facts are jury functions.” Id. at 255. But conclusory and speculative testimony does not raise genuine issues of fact and is insufficient to defeat summary judgment. See Thornhill Publ’g Co., Inc. v. GTE Corp., 594 F.2d 730, 738 (9th Cir.1979). IV. DISCUSSION M.B.’s motion is denied in its entirety. Defendants’ motion is denied as to the Monell claim, negligence claim, and request for punitive damages and granted as to all remaining claims. A. Evidentiary Objections Defendants raise a number of objections to the evidence M.B. proffers in support of his motion. Specifically, Defendants object to M.B.’s reliance on statements from Chief of the San Francisco Juvenile Probation Department Katherine Miller, Assistant Chief Gabriel Calvillo, and Acting Director Palei Otuhiva; findings from the Probation Department’s Skelly process and related request-for-admission responses; reports from Disability Rights California (“DRC”), the California Board of State and Community Corrections (“BSCC”), and the American Institutes for Research; and emails from Public Defender Emily Goldman from 2024–2025. (Dkt. No. 113-1 at 18–22.) Subject to the limitations and qualifications described below, the evidence is admissible and therefore may be permissibly considered for summary judgment purposes. First, statements from Miller, Calvillo, and Otuhiva regarding how Defendants’ actions aligned with jail policies and whether Thomasson’s purported purpose for subjecting M.B. to room confinement was consistent with established practices and what was typically treated as an imminent threat constitute proper lay opinions. (E.g., Dkt. No. 111-3 at 57 (investigation report).) However, statements regarding Thomasson’s actual intent are speculative, do not constitute proper lay opinions, and therefore cannot be considered on summary judgment. (E.g., Dkt. No.

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M. B. v. City and County of San Francisco, et al., (N.D. Cal. 2026).

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