Why cocaine was in the White House will stay a mystery: Secret Service

The Secret Service has concluded its investigation into the mystery surrounding who left a bag of cocaine at the White House – and there are no leads.

There was "no usable forensic or video evidence" to help uncover who the culprit was, NBC reported.

"The small plastic baggie with a powdered substance — which was found in a storage cubby at the White House on a Sunday evening earlier this month — was subjected to advanced testing and examined at two different federal labs but no usable fingerprints or DNA were detected, the officials said," NBC News' report stated.

Read it at NBC News.