But it is difficult to challenge this congressional “privilege” in the US, in part because insider trading is an ambiguous concept under US law, with no statutory definitions of the terms “insider,” “inside information,” or “insider trading.”
但要在美国挑战这个国会“特权”却相当困难，这在某种程度上是因为内幕交易在美国法律中是个模糊概念，同时对“内幕交易者”，“内部信息”或者“内幕交易”都缺乏法律定义。