David Demarest v. City of Vallejo, 44 F.4th 1209

Background

David Demarest, visiting California, drove into a Vallejo DUI checkpoint that was marked and conducted under an Operation Plan; signs announced both DUI and driver’s license checks.
Officer Jodi Brown asked Demarest for his license; Demarest refused on the asserted Fourth Amendment ground that the request was unlawful and asked to be let through.
Officer Brown removed Demarest from the car, handcuffed and arrested him; county later dismissed criminal charges after diversion.
Demarest sued under 42 U.S.C. § 1983 alleging: (1) unlawful detention at the checkpoint (license checks made the stop unreasonable), (2) arrest without probable cause, (3) excessive force, and (4) municipal liability under Monell.
The district court granted summary judgment for Officer Brown and the City; the Ninth Circuit affirmed.

Issues

Issue	Plaintiff's Argument	Defendant's Argument	Held
1. Whether adding routine license checks to a DUI checkpoint renders the seizure unlawful	Demarest: License checks at a DUI checkpoint unreasonably prolong seizure and are not justified by the checkpoint’s primary (drunk-driving) purpose	City: License checks are a permissible, minimal adjunct to a lawful DUI checkpoint and advance roadway safety	Held: Objectively reasonable; license checks are appropriately tailored, minimally intrusive, and may be considered because they advance permissible safety interests
2. Whether arrest for refusing to produce a license lacked probable cause	Demarest: Officer Brown lacked probable cause because she wasn’t enforcing another Vehicle Code provision that justified demanding the license	Brown/City: A lawful sobriety checkpoint is an enforcement of the Vehicle Code (Cal. Veh. Code § 2814.2), so refusal to produce a license violates Cal. Veh. Code § 12951(b)	Held: Once Demarest refused, officer had probable cause to arrest under California law; arrest was reasonable under the Fourth Amendment
3. Whether Officer Brown used excessive force in removing/arresting Demarest	Demarest: Physical removal aggravated his back injury and handcuffing was excessive	Brown/City: Force was minimal, objectively reasonable to effect arrest, and there was no evidence she knew of a disabling back condition	Held: Use of force was objectively reasonable as a matter of law; not excessive
4. Whether the City is liable under Monell for customs, training, or policy	Demarest: City ratified or failed to train/supervise officers leading to constitutional violations	City: No underlying constitutional violation by Brown, so no municipal liability	Held: Monell claim fails because plaintiff did not establish an underlying constitutional violation

Key Cases Cited

United States v. Martinez-Fuerte, 428 U.S. 543 (upheld limited suspicionless immigration checkpoints on balance-of-interests grounds)
Delaware v. Prouse, 440 U.S. 648 (roving, suspicionless license checks unconstitutional; distinguished fixed checkpoints)
Michigan Dep't of State Police v. Sitz, 496 U.S. 444 (upheld sobriety checkpoints as minimally intrusive and serving significant public interest)
City of Indianapolis v. Edmond, 531 U.S. 32 (struck down checkpoints whose primary purpose is general crime control)
Illinois v. Lidster, 540 U.S. 419 (information-seeking checkpoints may be reasonable under an individual-circumstances test)
Ashcroft v. al-Kidd, 563 U.S. 731 (Fourth Amendment reasonableness is generally an objective inquiry)
Bond v. United States, 529 U.S. 334 (subjective intent irrelevant; analyze objective effect for Fourth Amendment claims)
Virginia v. Moore, 553 U.S. 164 (state law restrictions do not alter Fourth Amendment reasonableness for arrests)
Graham v. Connor, 490 U.S. 386 (excessive-force claims governed by Fourth Amendment objective reasonableness)
Kingsley v. Hendrickson, 576 U.S. 389 (factors for assessing force include need, amount used, injuries, and perceived threat)