The United States Justice Department is monitoring the country's Drug Enforcement Administration (DEA), which is often accused of misleading the courts about the cases they bring.
Observes say the information procured by the Special Operations Division of DEA is being introduced into criminal cases without the knowledge of the courts.
The Justice Department has told Al Jazeera that it is looking into the allegations which focus on the surveillance techniques used by the DEA.
Al Jazeera's Shihab Rattansi reports from Washington.
Source: Al Jazeera