A 350-word entry in the Internal Revenue Manual instructed agents of the U.S. tax agency to omit any reference to tips supplied by the DEA's Special Operations Division, especially from affidavits, court proceedings or investigative files...
Monday's Reuters report cited internal government documents that show that law enforcement agents have been trained to conceal how such investigations truly begin - to "recreate" the investigative trail to effectively cover up the original source of the information.
DEA officials said the practice is legal and has been in near-daily use since the 1990s. They have said that its purpose is to protect sources and methods, not to withhold evidence.
Defence attorneys and some former judges and prosecutors say that systematically hiding potential evidence from defendants violates the U.S. Constitution. According to documents and interviews, agents use a procedure they call "parallel construction" to recreate the investigative trail, stating in affidavits or in court, for example, that an investigation began with a traffic infraction rather than an SOD tip.