Here's an article on a brain scanning technique that reads people's intentions.

There's not a lot of detail, but my guess is that it doesn't work very well. But that's not really the point. If it doesn't work today, it will in five, ten, twenty years; it will work eventually.

What we need to do, today, is debate the legality and ethics of these sorts of interrogations:

"These techniques are emerging and we need an ethical debate about the implications, so that one day we're not surprised and overwhelmed and caught on the wrong foot by what they can do. These things are going to come to us in the next few years and we should really be prepared," Professor Haynes told the Guardian.

The use of brain scanners to judge whether people are likely to commit crimes is a contentious issue that society should tackle now, according to Prof Haynes. "We see the danger that this might become compulsory one day, but we have to be aware that if we prohibit it, we are also denying people who aren't going to commit any crime the possibility of proving their innocence."

More discussion along these lines is in the article. And I wrote about this sort of thing in 2005, in the context of Judge Roberts' confirmation hearings.

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