Precisely the circumstances you're trying to imagine is being done by the DEA using information from NSA intercepts: "(Reuters) - A secretive U.S. Drug Enforce

Precisely the circumstances you're trying to imagine is being done by the DEA using information from NSA intercepts: "(Reuters) - A secretive U.S. Drug Enforcement Administration unit is funnelling information from intelligence intercepts, wiretaps, informants and a massive database of telephone records to authorities across the nation to help them launch criminal investigations of Americans. Although these cases rarely involve national security issues, documents reviewed by Reuters show that law enforcement agents have been directed to conceal how such investigations truly begin - not only from defence lawyers but also sometimes from prosecutors and judges. The undated documents show that federal agents are trained to recreate the investigative trail to effectively cover up where the information originated." I recommend the whole article here: http://uk.reuters.com/article/2013/08/05/uk-dea-sod-idUKBRE9740HP20130805 http://uk.reuters.com/article/2013/08/05/uk-dea-sod-idUKBRE9...