Moderna's coronavirus vaccine program is far from perfect, and it has a slew of red flags that investors should be aware of. The company has not produced any inoculations or therapies in its lifetime -- in fact, it's gotten nowhere close until now. And the science behind Moderna's coronavirus vaccine has never been proven to work for any disease or condition before, so the company can't lean on findings from prior successes to support its efforts. To make matters worse, executives have been divesting their shares at a steady pace, inviting scrutiny from the press regarding insider trading.