let's discover why with ankush khardori. former prosecutor in the front section of the u.s.ustice department. give us a lay of the land of why so few cases. is it so difficult to prove ? >> one of the answers is a simple resource issue. in terms of the white collar space, the amount of resources that the agencies have, in relationship to fraud of all sorts of types throughout the markets, it pales in comparison. even if you zero in on just this particular conduct and abstract out the resource question, these are uniquely difficult cases to bring. the typical insider trading that people usually will see in the news is a case where there is a tip going from a corporate insider to may be a family member or someone misappropriating inside information. a lawyer working on something. you're going to get external evidence. whether it's an e-mail or a record of phone calls. in the case or sorts of cases that your story is focused on today, as are just insiders themselves trading on information of their own companies. you're not going to have those opportunities for evidence as with