Many startup companies require access to large sums of investment capital to take on well-established competitors. The need to raise such funding may encourage a startup’s founder to paint an overly optimistic picture of the business and exaggerate its ability to succeed. In some extreme circumstances, founders may resort to deception to convince investors to back their ventures. That’s fraud. Silicon Valley warning A medical testing startup provides a cautionary tale of what can happen when an aggressive entrepreneur plays fast and loose with the truth. Based on the extravagant claims of the Silicon Valley company’s founder, the startup raised more than $700 million and secured a $10 billion valuation. When evidence emerged that it couldn’t conduct extensive medical tests on tiny amounts of blood as it...