Yes, right away. You should talk to him and tell him the situation, this is usually free. Once you explain, he will tell you if its worth taking to court or not.
If it is on purpose, yes, or if the person who accused the other person did not know what was going on and thought something bad was happening, then no.
But if a policeman had proof that someone was...
In earlier times many women, and in some cases men, were triled and convicted of witchcraft. The same old story, they were burned at the stake and buried under a oak tree to prevent their evil from...