If, during a hearing, one takes pity on a police officer who is testifying as a state’s witness and offers him a granola bar when the judge decides to take an hour-long break right in the middle of his testimony, and then after the break this police officer, who took your granola bar so happily, starts making shit up on cross-examination in an effort to bolster the state’s weak case, can you ask him for your granola bar back?