Final answer:
The reader can infer from the dialogue that Petrocelli is acting as the prosecuting attorney for the first time in a court of law. O'Brien objects to Petrocelli's statement, suggesting that Petrocelli lacks experience as a trial lawyer. O'Brien's objection also implies that O'Brien has more experience than Petrocelli.
Step-by-step explanation:
The reader can infer from the dialogue that Petrocelli is acting as the prosecuting attorney for the first time in a court of law.
This can be inferred from Petrocelli's comment, 'It is a rule of the court that a lawyer may not argue with someone during questioning,' which suggests that Petrocelli is not familiar with this rule and therefore lacks experience as a trial lawyer.
Another inference that can be made is that O'Brien, the defense lawyer, has more experience than Petrocelli, as O'Brien objects to Petrocelli's statement, indicating that Petrocelli is soliciting an argument.