	Introduction

The failure of the U.S. Intelligence Community to provide better warning of the September 11, 2001, attacks has been widely attributed to the existence of "walls" between intelligence and law enforcement agencies. In December 2002, the Joint Inquiry into Intelligence Community Activities Before and After the Terrorist Attacks of September 11, 2001, established by the two congressional intelligence committees, made a factual finding that the "important point is that the Intelligence Community, for a variety of reasons, did not bring together and fully appreciate a range of information that could have greatly enhanced its chances of uncovering and preventing Usama Bin Ladin's plan to attack the United States on September 11, 2001." FISA permitted the dissemination to the law enforcement community of information relating to criminal activity incidentally acquired during a FISA electronic surveillance or physical search. Concern about these divisions did exist and there had been major initiatives largely as a result of concerns about the development of barriers between law enforcement and intelligence agencies in the aftermath of the controversy surrounding the illegal activities of the Banca Nazionale del Lavoro (BNL) and the Bank of Credit and Commerce International (BCCI) in the early 1990s. Members of Congress began to seek administrative and statutory changes that could facilitate information sharing in this area. Pursuant to P.L. Criticisms of the approach taken by the legislation were voiced by some civil libertarians. The Justice Department's opposition in 2000 to legislative proposals to remove barriers has been noted. It is clear in retrospect that there were those in both the Executive Branch and Congress who realized the need to lower barriers to sharing law enforcement and intelligence information, but their views did not, prior to 9/11, reflect a consensus in either branch. It was agreed that the counterterrorism effort must be based on sharing information from whatever source. Although a discussion of all the complex provisions that were included in the USA PATRIOT Act lies beyond the scope of this Report, several provisions address the sharing of law enforcement and intelligence information. 108-458 ) required that procedures be established under which federal agencies can share intelligence and law enforcement information about international terrorism. The political controversy surrounding NSA's electronic surveillance efforts and other data mining programs may come to focus on the sharing of information that some argue was not lawfully obtained, and this concern could lead to efforts to restrict information sharing across the boards. Ultimately, an information sharing policy that is largely consistent with public opinion and is held to account by rigorous oversight should enhance the chances that the dots can be connected without jeopardizing the rights of Americans. Observers see a danger, however, that gridlock in both the Executive and Legislative Branches might inhibit the government's ability to find effective and sensible ways to acquire and analyze information on new threats to the national security.
Almost all assessments of the attacks of September 11, 2001, have concluded that U.S. intelligence and law enforcement agencies had failed to share information that might have provided advance warning of the plot. This realization led Congress to approve provisions in the USA PATRIOT Act (P.L. 107-56) and subsequent legislation that removed barriers to information sharing between intelligence and law enforcement agencies, and mandated exchanges of information relating to terrorist threats. Most experts agreed that statutory changes, albeit difficult to enact, were essential to change the approaches taken by executive branch agencies.
The barriers that existed prior to September 2001 had a long history based on a determination to prevent government spying on U.S. persons. This had led to the establishment of high statutory barriers to the sharing of law enforcement and intelligence information. The statutes laid the foundation of the so-called "wall" between intelligence and law enforcement that was buttressed by regulations, Justice Department policies, and guidance from the judicial branch.
Despite the widespread acceptance of a barrier between law enforcement and intelligence, by the early 1990s it had become apparent to some that the two communities could mutually support efforts to combat international criminal activities including narcotics smuggling. Later in the decade dangerous threats to the U.S. posed by international terrorists came into sharper focus. Nevertheless, efforts to adjust laws, regulations, and practices did not succeed, drawing strong opposition from civil libertarians. Only the tragedy of the 9/11 attacks overcame earlier concerns and led Congress and the executive branch to remove most statutory barriers to information sharing.
Laws and regulations have changed significantly since September 2001 and an Information Sharing Executive (ISE) has been established within the Office of the Director of National Intelligence to design and implement information sharing procedures. It is clear, however, that sustaining the exchange of law enforcement and intelligence information remains a challenge. In particular, there is continued concern about sharing of information that might in some way jeopardize the rights of free speech or association of U.S. persons. This opposition has contributed to the difficulty Congress has had in addressing legislation in this area and can be expected to continue. Some argue that, given the extent of legislation enacted in recent years, extensive oversight of information sharing efforts may be an appropriate way to ensure that the balance between ensuring domestic security and protecting civil liberties can be maintained.
This report will be updated as additional information becomes available.