Wired.co.uk
Arranged neatly on a granite worktop in a windowless underground laboratory at the Scripps Institute in San Diego , California , are 16 small syringes filled with pure cocaine. Stacked up against the back wall are four rows of steel cages, each housing an albino mouse. The mice are being given a shot that contains 15mg/kg of the drug -- enough to get a human high. But although they're all injected with the liquid, only some of the mice demonstrate signs of restlessness. Over the next half-hour, eight of the red-eyed rodents scurry back and forth wildly, nibbling at their tails and pawing at the metal mesh of the cage.