There is a page of "Featured" exchanges, some of which include:
Fresenius Kabi confirming they are still acquiring a company even after its founder and board chair were arrested on a narcotics trafficking RICO:
https://www.pubmail.io/mail/thread/OF49EC78E8.C30281B7-ON862...
AmerisourceBergen confirming they paid out sales commissions based on the sale of opioid drugs, and changing that policy after the 60 minutes exposé:
https://www.pubmail.io/mail/thread/20171105013005.29768.F72D...
Some of the stuff is more trivial but needs to be done for completeness sake, like the WashPo denying payoff rumours:
https://www.pubmail.io/mail/thread/20171111020538.56788.2671...
Some of the stories are in silence - Cardinal Health and McKesson simply don't respond to any inquiries at all.
When it comes to investigative work, I think that the "story" is often in the aggregate rather than any one specific detail.
You should link to a 'demo' thread from the homepage. Maybe an example interview or discourse with a politician. This would be the best way to sell the idea.