Two whistleblowers at a pharmaceutical company responsible for one of the largest drug price increases in US history said the company bribed doctors and their staffs to increase sales, according to newly unsealed documents in federal court. The Justice Department has now intervened in the case after conducting its own extensive investigation -- a sign that the government believes the allegations levied by the whistleblowers are credible. Whistleblowers: Drug company offered 'bribes' doctors to boost sales - CNN