The crystal ball is out being recalibrated; the Magic 8 ball is in for repairs; and Madame Zuileka has not returned from her vacation. So we cannot tell you what your employer will do.
What we can tell you is that they do not need to prove squat, and if they do fire you, it will be a legal firing which will stand up under the law. They can fire you on suspicion of wrongdoing - they are not a court of law and don't need to prove anything at all. Google, at-will employment.
Two things I am tired of typing: 1.) A wrongful termination does not mean that you were fired for something you didn't do; it means that you were fired for a reason prohibited by law. 2.) The above answer, whatever it is, assumes that no legally binding contract or CBA expressly says otherwise. If it does, the terms of the contract apply.