Final answer:
Testimony about reputation is not admissible at trial because it is considered double hearsay.
Step-by-step explanation:
In a criminal trial, testimony about reputation is not admissible because it is considered double hearsay.
Hearsay refers to an out-of-court statement made by someone other than the witness testifying in court. In the case of testimony about reputation, it involves one person providing information about another person's reputation, which is then relayed to the court.
Since it involves the statements of two people, it falls under the category of double hearsay, which is generally not admissible as evidence in a trial.