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Some police forces are trained to watch for this very mistake when interrogating criminals.
Their stories are too complex, structured, polished or complete.
Mr Justice Kearns was also told that all "virtual chat/mess age exchange services" are to carry warnings, at callers' contact, that anyone who sends a message which is "grossly offensive or of an indecent or obscene character" will be guilty of an offence and that all callers must be over 18.
Virtual chat services enable two or more callers to exchange separate recorded messages between each other while connected to the service.
They do this to make sure you believe them, but think about it.