The question, as worded, is insufficient for even a generalized response, and gets into a sticky area of law on which much differing opinion has been written.
What kind of "threat" is being referred to? How was it communicated - verbally - in writing - via a third party? Were there witnesses to the alleged threat? Was it a threat to do bodily harm (criminal act)? Was it a threat to sue you or "ruin" you (civil act)? Are you in fear of your life . . . etc... etc ... etc?. Your best advice would be to consult with an attorney who practices in NC and lay out the full picture for their opinion.
There are a great many advantages of having printed communication. This kind of communication cannot be altered and can be used as evidence if need be for example.
There are a wide variety of circumstances in which a lawyer can prove a case of negligence against a nursing home. Evidence in these types of cases typically involve a video or audio recording of some kind demonstrating the accused negligence.
This is a "proof by contradiction", where the evidence would fail to support the reverse assumption, giving credence to the original hypothesis.
The main animal that is a threat to a panther would be man.
which kind of communication we have with clients in social work
Linguistic Evidence
Linguistic Evidence
Theroems
Non-verbal communication.
Visual communication. Body language.
Well..., on the internet in books what kind of evidence
You need the evidence of your own lungs, basically. You need to establish a work history that shows you were exposed long enough to be affected. You need comprehensive doctor's records. The company will try to prove that your illness came from cigarettes, carpet formaldehyde, everything except them, so in short- you need a lawyer. Your best bet is to look for a class action suit against your employer and join it.