(in the US) The prosecution presents its case first.
There is no specific protocol for giving gifts. Gifts can be anything from a Rosary, a Bible, or any other religious item.
"you can be the witness"
what evidence is given about death
A Material witness is person with information about an alleged criminal. The most recent version, allows a material witness to be held giving criminals proceedings.
immunity
Interviewing an eye witness is the most legit form of evidence. Having an eye witness on the stands can help to prosecute a criminal. If the witness lies on the stands, they are committing perjury they will serve time themselves. Therefore, eyewitnesses are more apt to tell the true recollection of what happened. ------------- I will not edit someone else's answer. However, this is incorrect. Eyewitness evidence is NOT the most legit. In fact, it is the least. However, it is very important for giving a lead, but you will not just stop there in an investigation. There still needs to be direct evidence found. You cannot solely rely on one's memory or recollection of an event. Interviewing an eyewitness is beneficial for taking field notes in which will be used in court but you must have tangible or direct evidence as well.
By giving evidence.
Anyone involved in a criminal offense can be charged with giving false testimony or falsifying evidence.
It means that one person (who allegedly witnessed something) is giving a differing account of what happened than another witness to the same event.
Generally speaking, a witness. They can be a witness for the defense or a witness for the prosecution in a criminal case. They can be a witness for the defense or a witness for the plaintiff in a civil case. If they are testifying in behalf of someone they would rather be testifying against, they are called a "hostile witness." NOTE: This question would be better to have been asked under the Legal or Law category so I will move it there.
To intimidate a witness is to do something that discourages the witness from appearing in court and testifying truthfully. This can be something as overt as making direct threats of harm to the witness if they appear and testify, or as low profile as staring or giving the witness the "hairy eyeball" in the corridor outside of the courtroom. Intimidation of a witness is a serious crime. The offense can be charged as a felony even if the case in which the witness is to testify concerns only a misdemeanor.
It's when you support something by giving much information.