This stuff will get to the point where it works reliably. And to the point where it works reliably and gives you more information than just "guilty knowledge".

This stuff will get to the point where it works reliably. And to the point where it works reliably and gives you more information than just "guilty knowledge". ... which is why it needs to be banned now. Worldwide. For private use and for government use. By statute, by treaty, by constitutional amendment, by whatever legal vehicle is available. Not allowed, full stop. I don't care how many crimes you could solve; we do not need mind reading loose in the world. By the way, that includes banning it when people ask to have it used to clear them. There's no way to allow that without the surrounding system adjusting itself to make it suspicious not to ask. I will grudgingly allow a tightly restricted exception for medical use on locked-in patients. Govern yourselves accordingly... or wish you had.