This thread demonstrates the problem that LE in this country runs into all too frequently. Sure it's great when a walk-in comes in and provides useful information. The success of police tip lines and shows like America's Most Wanted certainly demonstrate that valuable information can gained from "walk-in sources." But there are limits to that. The type of people who report information because it is the right thing to do aren't typically the type of people to be directly involved in the activities they are reporting on. They can only report what they see from the outside. That means that in order to get "inside" information LE still has to get people who are directly involved to give that information up, either by the carrot (money, shortened prison terms etc.) or the stick (lengthened prison terms, higher charges etc.)

It can also work in an opposite way. In Northern Ireland a UK Customs officer accompanied a friend to an Army base to complain about his friend being roughed up. The officer he spoke to was offensive and rude (understandably as his regiment had lost men in the days before). The Customs officer became the local PIRA intelligence officer, with an ideal cover to be in the South Armagh area and legally carried a gun.
Wasn't it James Connelly or perhaps Michael Collins who bemoaned the fact that Irish Republican movement was shot through with informants? In fact, if memory serves, part of the reason that the Easter Uprising of 1916 was such a debacle was that British Intelligence used their network of informants to spread some disinformation.

SFC W