The Warrantless Trunk Search
At 02:15 you stop a sedan for a burned-out taillight on a city street. The driver, a woman, is nervous, and there is a strong odor of marijuana. She says the odor is from a passenger who left earlier. You see a locked hard case on the back seat. She refuses consent to search. Your partner says, "Just pop the trunk, probable cause is probable cause." A records check returns no warrants and a valid license. Arizona law permits recreational marijuana possession by adults within statutory limits, and the odor alone does not establish a crime. You have no K9 available.
1. Assess whether probable cause exists to search the vehicle, and identify what is missing.
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The odor of marijuana alone is not probable cause of a crime in Arizona, because adult possession within statutory limits is lawful. To search without a warrant under the automobile exception, you need probable cause to believe contraband or evidence of a crime is in the vehicle. The facts here are thin: a nervous driver, an odor she explains, and a locked case. Nervousness is common in any stop and carries little weight. The locked case is suspicious but locking something is not itself criminal.
What is missing is any fact tying the odor to an unlawful quantity, to impairment, or to distribution. Indicators that would help: visible packaging in bulk, scales, cash in plain view, admissions of unlicensed sale, signs of impairment supporting a DUI investigation, or an open container in reach of the driver. Without those, a search of the trunk would likely be suppressed. The partner's statement reflects a common error: probable cause is a standard, not a slogan, and it must rest on specific facts.
2. What lawful steps remain, and how do you handle the partner's suggestion?
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Several lawful steps remain. First, complete the traffic stop on the taillight and document the odor and the driver's explanation in the report. Second, if you observe signs of impairment, conduct a DUI investigation, which is independent of the search question. Third, ask again for consent in plain terms, and if refused, record the refusal. Fourth, request a K9 if one becomes available, but do not prolong the stop beyond the time reasonably needed for the traffic mission just to wait for a dog.
On the partner: do not open the trunk. Tell him directly that the odor alone is not probable cause under current law and that a search now risks suppression and a civil claim. If he believes there is more, ask him to articulate the specific facts he is relying on. If none exist, close the stop. Documenting the disagreement in your report protects both of you and shows the decision was deliberate.