United States v. Calderon, 1:17-cr-00036

On March 13, 2017, detectives from a HIDTA task force and an FBI task force surveilled a motel known to be used by a San Jose–based drug cartel after observing a California‑plated Subaru Forester pull into the motel.
Two men, later identified as Francisco Calderon (driver) and Luis Gaspar (passenger), stayed at the motel, interacted with a known local alleged drug user, then left in the Forester.
Agents followed the Forester onto the interstate and relayed information to Montana Highway Patrol Trooper Jack Rhodes; trooper observed the Forester brake suddenly while following a semi and initiated a traffic stop for following too closely.
Trooper Rhodes requested licenses and ran warrant checks; while waiting for confirmation, K‑9 Officer Nyquist arrived, obtained passenger information, and the checks revealed outstanding California arrest warrants for both men.
The trooper handcuffed and detained Calderon and Gaspar, a K‑9 sniff alerted on the vehicle, the vehicle was seized and impounded, and a search warrant for the Forester produced cash, phones, and a .38 revolver.

Issue	Plaintiff's Argument	Defendant's Argument	Held
Validity of stop	Government: traffic violation (following too closely) justified stop	Defendants: stop was pretext for drug investigation and lacked reasonable suspicion	Stop lawful — trooper credibly observed traffic violation that justified stop
Pretext doctrine effect	Government: pretext irrelevant if objective basis exists	Defendants: pretext taints the stop (relying on Cannon)	Pretext irrelevant under Whren; objective justification controls
Reasonable suspicion for drug investigation	Government: cumulative surveillance + motel connection gave suspicion	Defendants: contacts were too thin to support drug suspicion	No reasonable suspicion for drugs based on surveillance alone; traffic violation alone justified stop
Prolongation of stop / dog sniff	Government: warrant checks and confirmed warrants justified prolongation and K‑9 sniff	Defendants: K‑9 sniff and detention unreasonably prolonged traffic stop	No unreasonable prolongation — warrant checks and confirmed arrest warrants independently justified continued seizure; K‑9 sniff permissible

United States v. Rodriguez, 976 F.2d 592 (9th Cir. 1992) (warning against overbroad profiling in reasonable‑suspicion analysis)
United States v. Fowlkes, 804 F.3d 954 (9th Cir. 2015) (officer's subjective intent irrelevant if objective justification exists)
Whren v. United States, 517 U.S. 806 (1996) (pretextual stops permissible when an objective traffic violation justifies the stop)
Navarette v. California, 134 S. Ct. 1683 (2014) (reasonable suspicion depends on content and reliability of information)
Heien v. North Carolina, 135 S. Ct. 530 (2014) (reasonable suspicion can be based on a mistaken understanding of the law if reasonable)
Rodriguez v. United States, 135 S. Ct. 1609 (2015) (traffic‑stop may not be prolonged beyond time necessary absent independent reasonable suspicion)
Illinois v. Caballes, 543 U.S. 405 (2005) (dog sniff during a lawful traffic stop is not a search and is permissible if it does not unreasonably prolong the stop)
Payton v. New York, 445 U.S. 573 (1980) (arrest warrant authorizes taking a person into custody)