SAN JOSE, Calif. — In 2014, Dan Mosley, a lawyer and power broker among wealthy families, asked the entrepreneur Elizabeth Holmes for audited financial statements of Theranos, her blood testing start-up. Theranos never produced any, but Mr. Mosley invested $6 million in the company anyway — and wrote Ms. Holmes a gushing thank-you email for the opportunity.Bryan Tolbert, an investor at Hall Group, said his firm invested $5 million in Theranos in 2013, even though it did not have a detailed grasp of the start-up’s technologies or its work with pharmaceutical companies and the military.And Lisa Peterson, who handles investments for Michigan’s wealthy DeVos family, said she did not visit any of Theranos’s testing centers in Walgreens stores, call any Walgreens executives or hire any outside experts in science, regulations or legal matters to verify the start-up’s claims. In 2014, the DeVos family invested $100 million into the company.The humiliating details of bad investments like Theranos are rarely displayed so prominently to the public. But they have been laid bare in recent weeks at the trial of Ms. Holmes, 37, who faces a dozen counts of wire fraud and conspiracy to commit wire frau …
