Reason: Volokh Conspiracy: Can a State Police Officer Search a Car Based on Probable Cause of a Federal Marijuana Crime?

Reason: Volokh Conspiracy: Can a State Police Officer Search a Car Based on Probable Cause of a Federal Marijuana Crime? by Orin Kerr:

On Monday, March 3rd, a panel of the Ninth Circuit is going to hear argument in a case raising one of my favorite hypotheticals about cross-enforcement of the Fourth Amendment. The relevant issue in the appeal, United States v. David Martinez, No. 18-10498, is this: Can a police officer in a state that has decriminalized marijuana possession constitutionally justify a search of a car based on probable cause to believe marijuana is in the car as prohibited by federal law? In other words, can a search from an officer employed by the state look to federal criminal law for the probable cause needed to justify the search?

This is an example of what I have called cross-enforcement, a claim that a law enforcement officer employed by one government should be able to search or seize based on a violation of a different government’s law. Indeed, my article on the topic begins with this question:

Imagine you are a state police officer in a state that has decriminalized marijuana possession. You pull over a car for speeding, and you smell marijuana coming from inside the car. Marijuana possession is legal under state law but remains a federal offense. Can you search the car for evidence of the federal crime even though you are a state officer?

Even though, for example, in MMJ states where the smell of marijuana is no longer probable cause?

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