Discuss the signifi cance in the probable cause context of the phrase “conduct innocent in the eyes of the untrained may carry entirely different ‘messages’ to the experienced or trained . . ....

Discuss the signifi cance in the probable cause context of the phrase “conduct innocent in the eyes of the untrained may carry entirely different ‘messages’ to the experienced or trained . . . observer.” Davis v. United States, 409 F.2d 458, 460 (D.C. Cir. 1969). Discuss this specifi cally in terms of drug offenses and gambling offenses.