Suspicion is a terrible feeling. It is based partly on logic and largely on instinct, which is why any straightforward accusations you make will most likely be countered with a staunch denial that you can neither prove nor disprove. An unfaithful husband can say you are being insecure. A daughter who has not been caught taking drugs can argue that your are paranoid. Then you might begin to doubt yourself, although the suspicions will probably linger. You should hire a professional to get the truth.