Purchasing managers at Frito-Lay, Safeway, and B&G Foods have pleaded guilty to taking bribes that led to tainted foods purchased at inflated prices. Company officials relied on false reports and documentation supplied by their managers. How did food suppliers know whom to bribe? New Jersey businessman and food broker Randall Rahal said he could guess who would be susceptible to bribery by dropping a $100 bill on the floor, then picking it up and saying, “You must have dropped this. Is it yours?” Is this a good test?