MBE Rules · Criminal Procedure
Dog Sniffs
Caballes / Rodriguez / Jardines
The rule
A sniff during a lawful stop is not a search, but extending the stop beyond its mission for a sniff violates the Fourth Amendment absent independent reasonable suspicion, and bringing a dog onto a home's porch is a trespassory search.
In plain English
A dog sniff during a lawful traffic stop is not considered a search under the Fourth Amendment, meaning it doesn't require a warrant or probable cause. However, if the police extend the stop just to conduct a dog sniff without having reasonable suspicion, it violates the Fourth Amendment. Additionally, bringing a dog onto the porch of a home is considered a trespassory search, which is also unconstitutional.
Worked example
During a routine traffic stop for a broken tail light, the officer decides to have a drug-sniffing dog check the car. The stop lasts 20 minutes longer than necessary for the traffic violation, and the dog alerts to the presence of drugs. The evidence obtained from the search is likely to be suppressed because the officer extended the stop without reasonable suspicion.
Memory hook
A sniff is fine, but don’t stretch the stop or step on the porch!
The trap
Exams often present scenarios where students must distinguish between lawful and unlawful extensions of stops, leading to confusion about what constitutes reasonable suspicion. Additionally, students may overlook the implications of bringing a dog onto private property.
How examiners test it
Questions typically involve a scenario with a traffic stop or a home visit, asking whether the actions taken by law enforcement were constitutional under the Fourth Amendment regarding dog sniffs.
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