Back in March, I gave a public talk for Brain Awareness Week, "Brain Scans and the Magic Lasso." (An archived version is here).
In it, I talked about how I saw the use of fMRI as imminent in legal situations. And I was right, as I learned listening to the Nature podcast this week (transcript here). Companies called No Lie MRI and Cephos are going to sell commercial lie detection systems based on fMRI. And I pretty much called that in my talk. Legal challenges will happen, I predict.