Minority Report ... and hold the psychics.
In the year 2054, a so-called "pre-crime division" is working around Washington, DC. Its purpose is to use the precog(nitive) potential of three genetically altered humans to prevent murders. When the three precogs, who only work together, floating connected in a tank of fluid, have a vision, the names of the victim and the perpetrator as well as video imagery of the crime and the exact time it will happen, are given out to the special cops who then try to prevent the crime from happening. But there is a political dilemma: If someone is arrested before he commits a murder, can the person be accused of the murder, which - because of the arrest - never took place? ...OK. If this scan for intention gets much better, we can dispense with the psychics.
ScienceDaily: Revealing Secret Intentions In The Brain
... Our secret intentions remain concealed until we put them into action -so we believe. Now researchers have been able to decode these secret intentions from patterns of their brain activity. They let subjects freely and covertly choose between two possible tasks - to either add or subtract two numbers. They were then asked to hold in mind their intention for a while until the relevant numbers were presented on a screen. The researchers were able to recognize the subjects intentions with 70% accuracy based alone on their brain activity - even before the participants had seen the numbers and had started to perform the calculation.
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In future it will be possible to read even abstract thoughts and intentions out of patients' brains. One day even the intention to "open the blue folder" or "reply to the email" could be picked up by brain scanners and turned into the appropriate action.