United States v. Artis, 315 F. Supp. 3d 1142

Background

FBI Special Agent Stonie Carlson, deputized to a USMS-led joint fugitive task force, investigated Donnell Artis and Chanta Hopkins for alleged credit-card fraud.
On April 5, 2016 Carlson obtained an Alameda County Superior Court warrant to search Artis’s cell phone; a federal agent executed the warrant and searched the phone.
On April 7, 2016 Carlson obtained a different Alameda County Superior Court warrant authorizing use of a cell-site simulator to locate Hopkins; a federal officer operated the simulator, leading to Hopkins’s arrest and seizure of evidence.
California Penal Code defines search warrants as orders directed to a “peace officer,” and California law (Cal. Penal Code §§ 830, 830.8, 1523, 1528) excludes federal officers from the statutory list of state peace officers except in limited, circumscribed circumstances.
The government initially argued federal statutes (e.g., 28 U.S.C. § 564) gave US Marshals state-equivalent powers; the court concluded California may limit how federal officers participate in its criminal process and that state judges may not issue state search warrants to federal officers.
The court found a widespread lack of awareness among the FBI agent, the U.S. Attorney’s Office, and possibly local prosecutors and state judges about California’s restriction, and ordered transmission of the ruling to relevant agencies and courts.

Issues

Issue	Plaintiff's Argument	Defendant's Argument	Held
Whether California state judges may issue and direct state search warrants to federal law enforcement officers	Government: Federal law (e.g., USMS authority) permits federal officers to exercise powers akin to state sheriffs, enabling them to be issued state warrants	Defendants: California law limits peace-officer status to state-listed officers; federal officers are not state peace officers and cannot be issued state warrants	Held: State law controls; California statutes preclude state judges from issuing state search warrants to federal officers absent state authorization
Whether evidence obtained should be suppressed under exclusionary rule / good-faith exception	Government: Good-faith reliance supports admission; agents and judges likely acted in reasonable reliance	Defendants: Multiple errors and systemic recklessness by law enforcement justify suppression	Held: (In concurrently filed unpublished ruling) evidence suppressed due to numerous errors and pattern of systematic recklessness that undercuts good-faith exception
Whether Carlson and federal agencies had notice/training about California limits on federal officers’ role in state warrants	Government: Initially argued US statutes suffice; later acknowledged lack of state-authorized peace-officer status	Defendants: Agent acted without proper understanding or training; failures reflect negligence or recklessness	Held: Carlson was unaware; his employers also apparently unaware; court emphasized need for training and directed transmission of ruling to agencies
Whether state judges who issued warrants were misled or unaware of legal limits	Government: Paperwork and task-force context	Defendants: Judges should have known warrants authorized federal execution	Held: Record unclear; judges may have been unaware or misled; court notes possible culpable confusion but does not definitively find intentional deception

Key Cases Cited

United States v. Patrick, 842 F.3d 540 (7th Cir.) (cell-site simulator description and legal context)
United States v. Ellis, 270 F. Supp. 3d 1134 (N.D. Cal.) (cell-site simulator warrant discussion)
Carpenter v. United States, 138 S. Ct. 2206 (2018) (cell-site and location-privacy principles)
People v. Bell, 45 Cal. App. 4th 1030 (1996) (affiant need not be a peace officer to submit warrant affidavit)
People v. Athar, 105 Cal. App. 4th 479 (2003) (clarifying precedents cited in Bell)
State v. Quevedo, 843 N.W.2d 351 (S.D. 2014) (example of a state authorizing federal officers as state peace officers)