lets try to clarify what armstrong’s lawyers are saying on a likely example (i use a specific rider deliberately as it’s a reasonable speculation he may be subpoenaed by the grand jury)
levi leiheimer was publicly accused of blood doping by landis and holzer. in addition, lets say usada is sitting on another piece of evidence, that in combination with landis’s and holzer evidence, makes levi doping highly likely and allows usada opening an anti-doping rule violation proceedings against him.
if found guilty under the usada/wada rules for 2 separate doping offences (not even counting his us criteruim championship positive in the 90s), he will be kept you out of the sport for 8 years.
are you with me ? ..the proceeding hasn’t opened yet!
now, levi receives a subpoena from the federal grand jury. he goes there, receives immunity, admits his own doping and implicates several others. since it’s the grand jury stage, this info is officially sealed and at least technically the levi admission CAN NOT be used by the usada unless of course levi would tell them too. it is more than likely he will because during the actual public armstrong trial his admission will have surfaced anyway.
at that point usada will have a choice of opening proceedings against levi (or not) and if so usada may reduce levi sanctions (like in papp’s case) provided he cooperated with usada or the feds on suppliers, methods, other dopers…)
ao if levi ,like many other us athletes, received an educational letter from usada reminding him of the benefits of wada code 10.5.3 re cooperation (see publicus' post above), it is clear that armstrong lawyers are engaging in deliberate misinformation to intimidate usada and prevent athletes from telling the truth about their client.
and of course to score pr points via cheap obfuscation.