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Detection and prevention of inmate to inmate message relay

  • US 10,572,961 B2
  • Filed: 03/15/2016
  • Issued: 02/25/2020
  • Est. Priority Date: 03/15/2016
  • Status: Active Grant
First Claim
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1. A communication monitoring method, comprising:

  • receiving a communication involving an inmate of a controlled-environment facility, the received communication including audio data of a recorded conversation and metadata;

    extracting the metadata from the received communication, the metadata describing non-content information about the received communication and/or the conversation and including at least one timestamp;

    comparing the extracted metadata to metadata of a plurality of previously-stored communications;

    identifying a previously-stored second communication, from among the plurality of previously-stored communications that has metadata that is similar to the extracted metadata to within a predetermined degree;

    retrieving the previously-stored second communication;

    correlating spoken content of the received communication with spoken content of the previously-stored second communication, the correlating including;

    first comparing spoken content included in the audio data of the received communication to spoken content of the previously-stored second communication;

    second comparing non-spoken content included in the audio data of the received communication to non-spoken content of the previously-stored second communication;

    identifying a plurality of shared words and/or phrases that were spoken in both the received communication and the previously-stored second communication;

    for each of the plurality of shared words and/or phrases, determining a relevancy score indicative of a uniqueness and/or importance of the shared word and/or phrase; and

    determining a frequency of each of the shared words and/or phrases that appear in both the received communication and the previously-stored second communication, each frequency indicating a number of times the corresponding shared word and/or phrase appears in both the received communication and the previously-stored second communication;

    assigning a score to the received communication based on the correlation, the frequencies, and the relevancy scores of the shared words and/or phrases;

    comparing the score with a predetermined threshold; and

    determining the received communication to be an inmate-to-inmate communication based on the score comparison.

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