Psychological / emotional perspective: Many people do not like to look too closely at their own emotions, but to be investigating a building, for instance, can suggest that we are trying to understand ourselves and our own reactions.... Dream Meanings of Versatile
Material aspects: When we are unsure of our own position within a work hierarchy or family structure we may dream of an investigation in order to feel comfortable.
If we are being investigated in dreams we may feel we have not fulfilled a task to our own satisfaction. Such a dream may also suggest that we are being too closely monitored for our own liking.... Dream Meanings of Versatile
If you dream about an investigation, this suggests that you are trying to solve a problem that is worrying you.
If you are the one under investigation in your dream, and you know you are innocent, you will have fortune and honor. But if you feel you are guilty, then your reputation will be in jeopardy and your friends will turn away from you.... My Dream Interpretation