Be aware of false intel. These aren’t just lying. Sometimes people will plant evidence to convince you of something that is not real. It is important to make sure everything you see and hear are genuine, before making your own conclusion and acting on it.
At the same time, it is also important to realize, how this can be utilizing. It is possible to convince some of a lie you want, without saying the lie. All you need to do is convince the person of whatever you want, by planting evidence.