That happens a lot. The judge or jury decides who is more beleivable.
During opening arguments the prosecution presents theirs first, they will explain to a jury all of the circumstances of the case and explain what they will present to prove all of the evidence along with the type of testimony for the jury/judge to expect from any scheduled witnesses. The defense can present an opening argument at that time or they can reserve the option until after the prosecution presents their case. If the defense chooses to proceed with the opening they will explain why the Prosecutions case will be flawed, and what witnesses the defense will present to rebut the testimony of the prosecution witnesses.
During opening arguments the prosecution presents theirs first, they will explain to a jury all of the circumstances of the case and explain what they will present to prove all of the evidence along with the type of testimony for the jury/judge to expect from any scheduled witnesses. The defense can present an opening argument at that time or they can reserve the option until after the prosecution presents their case. If the defense chooses to proceed with the opening they will explain why the Prosecutions case will be flawed, and what witnesses the defense will present to rebut the testimony of the prosecution witnesses.
The defense tries to create doubt in the minds of the jury.
Elizabeth, she lies.
elizabeth proctor, his wife
If the prosecution doesn't show up for a scheduled court hearing, the case may be dismissed or postponed, depending on the circumstances and the judge's discretion. The defense may request a dismissal, especially if the absence is unjustified, but the court might also allow the prosecution to reschedule. In some cases, the judge could issue a bench warrant for the prosecutor or take other actions to ensure the case proceeds. Ultimately, the specific outcome depends on the jurisdiction and the nature of the case.
After the defense rests, the prosecution may have the opportunity to present rebuttal evidence, depending on the court's rules. Following this, the judge will typically provide instructions to the jury regarding the legal standards that must be applied to the case. The jury will then deliberate to reach a verdict. If it's a bench trial, the judge will deliberate and render a decision directly.
When they go through the process of Voire Dire, or the picking of the jury, a juror is presented and both attorneys get to ask a question of them. Then they either accept or don't accept that juror. If there is a disagreement between the prosecution and defense the judge decides.Each side gets a set number of "challenges for cause" and "peremptory (no cause) challenges."
The police and prosecutors investigate to see if prosecution is the next step.
Then that evidence can not be introduced in to court. They can not say "Well, we had evidence...".
The legal consequences for killing a possessed person would depend on the circumstances and laws of the jurisdiction involved. In most cases, claiming that the person was possessed would not be a valid legal defense for taking another person's life. It would be treated as a criminal act subject to prosecution.
You cannot "request evidence." If the prosecution does not introduce it at trial then there is nothing for the defense to request. If the defense has its own evidence they may introduce that. During the 'discovery' phase of the trial both sides will have, should have, listed all the evidence they intended to introduce. However, the failure of one side or the other to actually introduce it does not open the door for the opposition to demand that it be introduced.