[Margaret Pilkington]

There are many ways to lie........you can tell someone something which is balatantly untrue, or you can fail to correct an assumption that you know to be untrue........or you can just lie by saying nothing.

Some things are facts...these can be proved and corroborated.
Without all the information it is very difficult to say what should be done in this instance.
I was once in a position to observe a person in authority(and whom, up until that point, I had respected) try to blame a junior member of staff for something which I had seen this person do.....this was a fact, there was no subjectivity in it at all.
The person said she hadn't done the thing, which I had seen her do. She let a student carry the can for her mistake.
I spoke up for the student, but my evidence was not acted upon. I never, ever trusted, or respected this person again. I always watched my back because I felt if she could do this to a student then she would do it to other members of staff, myself included.