We can't read minds, and there's no such thing as truth serum, despite what people say. Unfortunately, or this whole mess could have been avoided.

We can sense emotions, and we can sometimes sense a lie. Sometimes. But the other problem is... Jedi are also capable of cloaking their feelings, words, presence, and so on and so forth. So being able to sometimes sense a lie is only useful when talking to a baseline individual. When speaking with another Force-user, it's virtually meaningless.