The U.S. Air Force is looking into how to handle an incident where Tesla CEO Elon Musk apparently smoked weed on a podcast. Musk is also CEO of SpaceX, the space transportation company, which holds multiple military contracts.

Marijuana use is prohibited for someone with a government security clearance, which Musk may have because of the contracts SpaceX has with the Air Force. It is not clear whether Musk has security clearance or not as CEO of SpaceX.

An Air Force spokesperson, in a statement to CNBC, said: "We will need time to determine the facts and the appropriate process to handle the situation."

A source on Friday told CNBC that the Air Force was looking into the matter on Musk following the podcast.