The FDA Statement by itself is enough to start with. Filing misrepresented and manipulated clinical trial data in a 8k and with the FDA is illegal. Then the deceptive press releases.
The FDA very likely tipped-off the SEC who showed the evidence to the DOJ who thought there was enough to investigate. That's the start -- with the numerous other stock frauds and insider trading, there is a whole quagmire of actions to investigate, document and put into a charging document.
Ghost-written articles, social media pumpers, misleading press releases and cc's will add considerable evidence.
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