I think in 2008 there was this Indian case of Udit Bharati who was accused of being killed by his wife through poisoning. They gave her brain scans and said that her brain lit up on certain evidence that only the killer would know of -- so she'd be guilty. I remember there being some controversy around it because they said that the cops could have seeded some of that information before questioning to induce this result or something. I think she was released after and I'm too tired to figure out what the legit sources of this are and the conclusion but I think it was a bit of a mess.