An accusation could never be enough to disqualify anything. If the evidence that perjury has taken place is strong, the court will naturally weigh lower any statement from this witness, but you could not describe such statements as "invalid".
Not in the same trial. Also - in any future legal proceeding where they may be called upon to give testimony - their past record of perjury CAN be introduced in an effort to impeach their testimony.
This is an age old practice that is still in play today. What it means is that the witness is swearing on God's word, the Bible, that the testimony will be true. Even though religion has lost ground the past number of years, most people still believe in God. Also, the penalties of perjury can be severe.
They dont have to have it if there is video or witness testimony stating that a gun was used they can still charge you with it.
Atticus says he only has one witness left to call after Mayella Ewell has finished testifying. This witness turns out to be Tom Robinson, whose testimony is crucial for the trial.
First, you ask the person to be a witness and whether he/she will voluntarily appear as a witness. It is usually wise to follow this up with a subpoena just in case the person has other plans or a change of mind. Second, if the person refuses and you still want the person as a witness, you subpoena the person to appear at trial. Third, you hire the person, if the person is going to give expert opinion testimony.
Yes she is still a Jehovah's Witness.
Whoever's side the witness is for can decide how to present the witness. It is not unheard of for prosecutor or defense attorneys to bring out the lie first, along with the reason(s) the person lied. However, the witness-confessional is usually extended only once; the person better fess up to everything right then. And even if the person puts everything out on the table, the judge or jury can still hold it against the person and choose not to believe the testimony, in part or in full.
It is 'the court' who decides who gets to be qualified as an "expert witness" - if the testimony was as badly mistaken as the questioner leads us to believe then the judge (or the jury) will take that discrepancy into account when they consider the verdict.
She's still a jehovah's witness.
Who? What? When? Where? NOPE
Rebbie Jackson is the only one who is still a witness.
If you mean, can they lie with impunity because they don't accept the Bible - as if their oath didn't count - the answer is no. Anyone can lie on the witness stand, of course, but it would still be perjury under any circumstances. An oath is an oath, whether the person swearing it believes the Bible is Scripture or not.