Drug prohibitionists are still playing one of their favorite games -- "whack-a-mole" with cocaine in South America. Peru's anti-drug police are locked in an ongoing game of cat-and-mouse in the Ene and Apurimac River Valleys against drug runners, many of whom are aligned with a remnant band of about 200 leftist Shining Path guerrillas. But, as usual and for ever more, the government appears to be losing the battle.