Still genuinely unsure of how they got FDA approval for human trials close to a federal investigation into their treatment of animals [1], I have not done human subjects research but I cannot imagine an EC going "oh well carry on then"

[1] https://www.forbes.com/sites/siladityaray/2022/12/06/musks-n...

They are only trialing this on quadriplegic patients with very specific situations.

https://neuralink.com/pdfs/PRIME-Study-Brochure.pdf