The police cadet’s duties were confined to taking statements from the crowd.
【confine】这位警校生的任务只是记录那群人的口供。
英语百科
Police cadet
A police cadet can refer either to a trainee police officer or to a member of a youth organisation in which young people learn about and/or participate in law enforcement and police work.
Many police departments in the United States offer police cadet programmes, as do a number of police forces in the United Kingdom.