If you are suspicious that someone who you know is giving information to police....
There are a number of sure things and spy and policeman are not to be confused, therefore,.... A state agent i.e. an agent of military intelligence will interview you in your own home or if you have multiple residencies or he thinks that you have multiple tenancies on otherwise houses,he will call to your door but not come in because he works in association with those who come to people's house or houses to kill them. All he needs to know is where you live...... And as regards that other type of spy,one of the sort of person who knows the power of the media,he will visit a journalist in person to arrange either his death or the death of a member of his or her family... Why? That is his job,not policing crime, arresting criminals,preventing theft but the quelling of dissent and stopping the poor taking part in riots..... ASK an undercover detective or suspect on a Sunday ONLY, "Have you signed the Official Secrets Act?" Do not say,simply," Is this the latest bunch of ...