BotanyBay said:
[snip] And there is an existing agreement in place TO share that kind of information.
I believe in general that Federal investigators may not share information with other parties. There are exceptions for other law enforcement agencies, but the exceptions need to be justified. USADA does not necessarily fit those guidelines; in fact they probably do not, and the US Attorney will probably require a court order to hand over the results of the investigation. That is, the DOJ will probably want direction from the courts. In the Balco case, the flow of information was from DOJ to US senate to USADA.
And a ratified international treaty does not necessarily trump existing US law.
I guess that it would take an injunction to get the DOJ to hand over evidence. Maybe the USADA has the gumption and funding to get one, but I suspect they won't try.
Remember, in a jury room, you never ask a witness a question that you do not already know the answer to. So they do have evidence that existed independently of the grand jury conversations.
In grand jury situations, I believe that it is common to ask probing questions. It is an effective way to compel answers during an investigation, or know that the prosecution is getting warm because the witness invokes the 5th amendment, or to trip the perjury trap. No worries about the wrong answer affecting the jury-- they'll indict a ham sandwich.
In fact, the 18 month or more time period spent providing testimony to the GJ in this case pretty much proves that part of the investigation was being done via compelled testimony. If they already knew what was needed to indict, an indictment would have already happened.