I have been called by the prosecution to testify in a case in which I am the ONLY witness. The prosecution has Threatened me that if I do not testify, they will throw ME in jail. Firstly, I need to know if they can force me to testify under duress of the threat of jail. Secondly, I need to know how likely, ( if possible, ) it is for the prosecution to actually take actions against me. I have made no statements to the police in this matter thus far. This case was brought about by a third-party hear-say call to the police about an alleged domestic violence incident. I am the only eye-witness in the incident besides the accused.. and the prosecutions case obviously greatly depends on me... so ALL I need to know is; Do I HAVE TO show up in court to testify? If so, WHY?