Elon Musk still hopes to implant human brains with a neural interface, but now he faces an annoying obstacle: His company, Neuralink, is under investigation by the United States Department of Transportation, of all agencies.

Following a letter from the Physicians Committee of Responsible Medicine to the DoT, Reuters reports the department opened an investigation into Neuralink over the potential illegal movement of hazardous pathogens after the implants were removed from the brains of monkeys.

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Musk’s goal with Neuralink is to establish a neural interface that surgeons implant directly into the brain, potentially restoring motor function and treating neurological disorders in patients that need it. Of course, there’s also talk of adding plenty of features that aren’t exactly medically necessary, such as streaming music directly through the brain-computer interface.

But Musk isn’t there yet, and plenty of testing is still needed.

Read more: Popular Mechanics