What is the objection to cross-examination of a character witness?

Is it reversible error for a witness to testify over objection whether a previous witness was telling the truth? (MultiRegion, United States of America)

Can a prosecutor cross-examine a witness to state that the witness is offering false testimony? (MultiRegion, United States of America)

Does the Government have any case law that supports its argument that "the same analysis applies whether the witness is an expert or a lay witness"? (MultiRegion, United States of America)

Can the Crown argue that answers obtained on the cross-examination of a witness can be used to attack the credibility of another witness? (Canada (Federal), Canada)

Does counsel's refusal to renew his objection because it was so forcefully presented and unequivocally rebuffed by the court that it was apparent that further efforts to object would be unavailing? (MultiRegion, United States of America)

Is there a prejudicial error if a witness is a cooperating witness? (MultiRegion, United States of America)

Can we reverse if the evidence supports the reasonable inference that by giving a nod to a witness that the witness was guilty of perjury? (MultiRegion, United States of America)

Does a court's admission in evidence over objection of certain objects seized from his home after he had been taken to and detained at the police station constitute a violation of his Fourteenth Amendment rights? (MultiRegion, United States of America)

What is the test for establishing that a witness is unavailable to be extradited from the country where the witness is based? (MultiRegion, United States of America)

If a witness is intimidated into giving evidence to a grand jury, is that intimidation offset by the introduction of the witness's prior testimony? (MultiRegion, United States of America)