Historically, the Criminal Investigation Division’s scope and tactics have been limited and rarely relied on telecommunications interceptions. But according to British newspaper The Guardian, the IRS purchased a number of Stingray devices in 2009 and 2012. Known also as IMSI catchers, Stingrays are portable communications-interception devices, which mimic the operation of cell phone towers. They gather data, including the phone numbers dialed, duration of phone calls and location of users, from cell phones that communicate with them. Some Stingray models are said to be able to intercept the content of telephone calls made by unsuspecting cell phone users.
According to The Guardian, the IRS made an initial order to purchase Stingray equipment in 2009 and repeated the request in 2012. At least 12 US federal agencies and hundreds of local law enforcement agencies use Stingrays for communications-interception purposes. But the London-based paper says this is the first time that the IRS has been found to be using the devices. It is unclear, however, what the IRS uses the Stingrays for. The Guardian said it contacted an IRS spokesman who refused to respond to questions on the matter.