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(WBIR - Nashville) The Tennessee Department of Corrections on Friday announced a new method for lethal injection executions in the state.

TDOC said it will now use a single drug protocol to replace the previously used three-drug method.

The state said sedative pentobarbital will be the only drug allowed to be used in future court ordered executions.

A press release stated that the use of pentobarbital has been upheld in court challenges and used in other states.

Back in 2011, the state's entire stock of part of its former lethal injection drug was confiscated by the federal government after questions surrounding whether it was legally obtained.

TDOC's Communications Director told 10News when a date is set for a future execution the state will have enough of the new lethal injection drug.

The last person executed in Tennessee was in December 2009.