Difficult to answer. If there was an arrest involved, the arresting officer(s) will also testify as to what they saw and observed at the time. If their testimony is strongly indicative of the fact that an assault did occur (i.e.: obvious injuries - etc) the judge may discount his testimony and could convict you anyway. What most people don't understand, is that in Domestic Violence cases it is not up to the victim whether THEY want to press charges or not. Domestic Violence is a criminal assault crime committed against 'the state.' Your husband may be a reluctant witness, but it is not within his power to "drop" the charges.
Yes, if they have proven it tho...
YOU cannot have the charges dropped by yourself. Such an assault is a crime against the state and only the prosecutor can 'drop' the charges. If you are a reluctant 'complaining witness' speak to the prosecutor about your hesitation to go forward.
If you are in witness protection you have not necessarily been charged with anything you are just being protected from harm by people you bear witness against.
It depends. Does the killer know that the murder was witnessed. If so, the witness may be next. Legally, the witness may have charges filed against them as a co-conspirator or obstruction of justice.
(in the US) Yes, the accused has the Constitutional right to be confronted by the witness against him.
If you are the victim and it was reported to law enforcement it is probably too late to "drop" the charges. Sexual assaults are characterized as crimes against the state and once investigation and prosecution have begun it is too late to stop it. You can contact the prosecutor or investigating agency and declare that you would be an un-willing witness but even that might not be successful.
If there is a witness who can testafy, then yes. Also if you made any statement saying you did, then they can.
"People" don't press charges. The State (in the form of the prosecutor's office) presses charges. If the complainant in the offense you are being charged with is currently in prison, does not mean that you he can't be a witness against you in the offense you allegedly committed against him.
Citizens cannot "press charges." The only thing a victim can do is contact law enforcement and report the incident and cooperate with police and prosecutors as they make a criminal charge. The victim/witness does not receive any compensation.
No
Witness Against Torture was created in 2005.
Witness Against the Beast was created in 1993.