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In the conclusion of a two-part story arc, con man Shifty Shafer (Phil Silver) has inveigled Jed Clampett into yet another risky investment. This time, Shafer has convinced Jed to bankroll a drilling project, designed to siphon the smog from Los Angeles! In the course of events, both Shifty and his wife Flo (Kathleen Freeman) are compelled to impersonate Mexicans -- musical comedy accents and all. "Honesty Is the Best Policy" originally aired on March 18, 1970, as the final episode of The Beverly Hillbillies' eighth season.