According to a government audit, IRS Agents ‘Accidentally’ Discharged Guns 11 Times (external - login to view) between 2009 and 2011. Some of those weapons discharges resulted in property damage or personal injury, claimed the report. In fact, agents accidentally fired their guns more times than they did intentionally, said the Treasury Inspector General for Tax Administration. The IRS’s Criminal Investigation Division is armed, but armed or not, the IRS wields enormous power.
In United States v. Adams, Charles Adams’ conviction for conspiracy and tax evasion were upheld despite his claims that the IRS agents carried guns not allowed by law. Mr. Adams said guns were legal only when the government is enforcing alcohol, tobacco and firearms laws. But this was just a tax search, he argued.
IRS Totes Guns, But Doesn't Use Helicopters--Yet - Forbes (external - login to view)
actual IRS weapons-firing graph