Background
Illinois State Police Sergeant Mark Flack stopped Robert L. Pennington, Jr. for speeding on Interstate 57. After issuing a warning and returning Pennington’s documents, Flack continued questioning him for about three minutes about drugs, nervousness, consent to search, and parole or probation. Pennington refused consent and eventually left. Flack then alerted canine officer Sergeant John Lillard, sharing Pennington’s vehicle description, direction of travel, refusal to consent, and drug-related criminal history.
About an hour later, Lillard saw Pennington improperly pull in front of a semi-truck and stopped him for improper lane usage. While officers prepared a warning, Lillard conducted a dog sniff, and the dog alerted before the warning was completed. A search uncovered crack cocaine. After the district court denied Pennington’s suppression and dismissal motions, he entered a conditional guilty plea to possessing with intent to distribute at least 28 grams of cocaine base and received ten years’ imprisonment and eight years’ supervised release. A presidential commutation later ended his prison term, but his conviction and supervised release remained in effect.
The Court’s Holding
The Seventh Circuit affirmed. The majority held that Flack violated the Fourth Amendment by continuing to detain and question Pennington after completing the first stop’s traffic mission. The encounter was not consensual because a reasonable person seated in Flack’s squad car—particularly after asking whether he could leave and receiving no answer—would not have felt free to terminate it.
Suppression nevertheless was unwarranted because the evidence discovered during the second stop was sufficiently attenuated from the first stop’s illegality. About an hour had passed, Pennington committed a new traffic violation that independently justified Lillard’s stop, and the officers’ conduct was not sufficiently purposeful or flagrant to make exclusion serve a meaningful deterrent function. The majority also upheld the second stop, concluding that the records checks, questioning, technical delay, transfer of warning-writing duties, and dog sniff did not prolong it beyond the time reasonably needed to issue the warning.
The court further held that Pennington was not entitled to an evidentiary hearing on selective enforcement. Although Lillard knew Pennington had refused Flack’s search request, Pennington did not make a prima facie showing that officers stopped him because he exercised a constitutional right or treated him differently from similarly situated drivers. Judge Hamilton dissented, reasoning that the coordinated stops and redundant records checks unlawfully prolonged the second stop and enabled the dog sniff.
Key Takeaways
- Continuing to detain and question a driver after issuing a warning and returning the driver’s documents can unlawfully prolong a traffic stop, even if officers characterize the ensuing interaction as consensual.
- An independent traffic violation during a later, coordinated stop may attenuate evidence from an earlier unlawful detention when the intervening violation breaks the causal chain and the prior misconduct was not purposeful or flagrant.
- A dog sniff is permissible during a lawful traffic stop if it does not add time to the stop; officers may divide traffic-related duties so long as the transfer itself causes no prolongation.
- A selective-enforcement claimant seeking a hearing must present facts raising a reasonable doubt that officers acted with discriminatory purpose, including evidence of differential treatment or enforcement because of protected conduct.
Why It Matters
The decision distinguishes between finding a Fourth Amendment violation and applying the exclusionary rule. Even though the first officer unlawfully extended Pennington’s detention, the majority treated his later traffic violation as an intervening event that allowed evidence from the second stop to remain admissible.
The divided opinion also highlights disagreement over coordinated successive traffic stops. The majority assessed the second officer’s records checks and dog sniff as part of an independently justified stop, while the dissent viewed the officers’ coordination and redundant tasks as gamesmanship that prolonged the detention for drug-interdiction purposes.