I did my thesis on EEG signals, also having a very idealistic view of what could I do with it, only to find that even the most basic of tasks is hard to classify (even to find motor cortex movement intention signatures (if you want to move left or right hand)).
This work will not go into the real world in this stage, as it is badly done and most certainly having multiple flaws in the implementation, rendering it unusable in the real world.
So, don't get too stressed out about this, if it happens, it will be about 20-30 years from now. And keeping in mind how slow the law enforcement technology moves forward (aren't most of them still using windows xp and vista?) I would count more like 30-50 years.
https://www.vox.com/culture/2017/12/29/16808458/black-mirror...
Currently eyewitness criminal sketches are still drawn by artist so they are naturally low fidelity.
That will change once you can generate a photo of a face (like https://thispersondoesnotexist.com/) based on your brain waves.
This will be disastrous on so many levels. The eyewitness might not have a good sample of a minority race. The GAN dataset itself might also only be trained on celebrity faces so it doesn't know how to generate anything else (e.g., a teen).
But it will be deceptively high resolution so police will rely on it.
If you have a generic face your life is fucked.