What is the test of probable cause in the context of drug trafficking cases?

hypothesis, therefore, innocent behavior frequently will provide the basis for a showing of probable cause; . . . In making a determination of probable cause the relevant inquiry is not whether particular conduct is 'innocent' or 'guilty,' but the degree of suspicion that attaches to particular types of noncriminal acts." (Id. at p. 245.) "There is probable cause if a ' "succession of superficially innocent events ha[s] proceeded to the point where a prudent man could say to himself that an innocent course of conduct was substantially less likely than a criminal one." ' [Citations.]" (People v. Andrino (1989) 210 Cal.App.3d 1395, 1402.)

"The test of probable cause 'should not be understood as placing the ordinary man of ordinary care and prudence and the officer experienced in the detection of narcotics offenders in the same class. Circumstances and conduct which would not excite the suspicion of the man on the street might be highly significant to an officer who had had extensive training and experience in the devious and cunning devices used by narcotics offenders to conceal their crimes.' [Citation.]" (People v. Johnson (1971) 21 Cal.App.3d 235, 244.)