Does a federal officer have a greater right than a state agent to investigate at the request of a public carrier?

Finally, it is noted that it may be that under federal law the federal officer had a greater right than a state agent to investigate at the request of a public carrier. (See cases collected, People v. Baker, supra, 12 Cal.App.3d at p. 837, 96 Cal.Rptr. 760.) A state doctrine which excluded evidence obtained as a result of proper federal action, might uphold the sanctity of the state's ideals of the administration

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No error can be predicated upon the prosecution's failure to call the federal agent as a witness.