Русско-англо-русский юридический словарь

Tony Brown, a former military police officer who became a secret informant for Merseyside Police, faced three trials spanning five years before proceedings against him collapsed last week. (Liverpool Echo)

But instead of going forward with the plot, the boyfriend rushed to the FBI with the information and became a secret informant, according to charging documents reported by the New York Post. (Daily Mail)

But in his defence he claimed to have been a secret informant for Spanish police. (Daily Express)

A confidential informant is a person who provides information about criminal activity to law enforcement officers. (USLegal)