If you were forced to take a tb shot while you were in police custody, I suggest that you consult with a criminal defense lawyer who practices law in the area of personal injury as well to see what was the factual and legal basis for you having to take a tb shot. In most jurisdictions in this country, if there is a legitimate concern that a person may pose a danger to the public, that person can be forced to have the injection that you have written about. This could be the reason for your shot.With respect to your employer's questioning of you as to the scar resulting from the tb shot, I would simply tell him or her that you had a tb booster as a health precaution.