You’d think that after last year’s humiliating iPhone 4 prototype caper, Apple would have taken extraordinary precautions to protect pre-release versions of future iPhones taken into the field for testing. Evidently not. The company has lost another prototype iPhone. And like the one that preceded it, this one too was lost in a bar. CNET has the scoop, and the company is declining comment. Apple should really begin requiring signed sobriety pledges from anyone given a prototype.