it's bullshit.
these days just saying so and so has a drug problem isn't enough for the media to draw attention to it, cause everyone these days has a drug problem.
so, the media adds 'possibly may be working with federal authorities' to make the story more publicly appealing while at the same time ruining the credibility of the athlete without endangering themselves with a lawsuit.
if this was 20 years ago and kazur had a drug problem, like favre, then it would be news. not today.