Question

An officer who smells marijuana as he drives by a car with an open window:
a. cannot compel the driver to stop the car so he can investigate without a warrant.
b. is limited to noting the license plate number of the vehicle and initiating a stakeout of the owner's home in order to gather additional evidence.
c. is authorized to stop the car to investigate without a warrant or probable cause because it is a plain search and outside the scope of the Fourth Amendment.
d. is authorized to stop and investigate because he has probable cause under the Fourth Amendment.

Answer

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