The exhibit, a Feb. 2 letter prosecutors sent to defense lawyers, was later sealed, but Reuters viewed it while it was publicly available.
Kapoor, who founded Insys in 2002 and remains a board member, stepped down in January as the company’s chairman and chief executive, a role he took on in November 2015.
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He is currently the chairman of drugmaker Akorn Inc and president of investment firm EJ Financial Enterprises Inc.
In addition to the Boston case, charges have been filed against former Insys employees and medical practitioners by federal prosecutors in states including Alabama, New York and Connecticut.
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