To dream of incriminating evidence represents proof of guilt, or blame that can’t be avoided. Your feelings about your involvement with a problem.
It may also be a sign that you are too preoccupied with blaming yourself for something bad that happened. Making yourself believe you’re guilty.
Example: A man dreamed of seeing men planting incriminating evidence over a room with a dead body in it. In waking life he felt guilty for not doing enough to help a friend before a big problem started. The men planting the incriminating evidence represented how he was dwelling too much on his involvement in his friends problem.