Many details have been published in the media. For instance: "Documents filed in U.S. courts last year outlined how McKinsey discussed ways for Purdue to “turbocharge” sales of its drug OxyContin, including paying Purdue’s distributors a rebate for every OxyContin overdose attributable to pills they sold."

source: https://www.theglobeandmail.com/politics/article-mckinsey-is...