Answer:
There are a few different objections that defense counsel might make in this situation. One possible objection is that the testimony is hearsay. Hearsay is a statement made by someone other than the witness that is offered as evidence to prove the truth of the matter asserted. In this case, Officer Johnny Law is not the person who saw the defendant leave through the window; he is merely repeating what he was told by someone else. As such, his testimony would be considered hearsay and might be excluded from evidence if the objection is sustained.
Another possible objection is that the testimony lacks foundation. Foundation refers to the evidence that must be presented to establish that a witness is qualified to give testimony and that the testimony is relevant and reliable. In order to establish foundation for Officer Johnny Law's testimony, the prosecutor would need to show that he has personal knowledge of the events in question and is competent to testify about them. If the defense counsel believes that the prosecutor has not established an adequate foundation for the officer's testimony, they may object on these grounds.
A third possible objection is that the testimony is based on speculation or conjecture. If the defense counsel believes that Officer Johnny Law's testimony is not based on personal observation or firsthand knowledge, but rather on assumptions or guesses, they may object on the grounds that the testimony is speculative or conjecture.