References

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1. https://www.wgbh.org/news/local/2023-11-17/massachusetts-becomes-fifth-state-in-nation-to-make-prison-calls-free

2. https://oig.justice.gov/sites/default/files/legacy/special/9908/exec.htm#:~:text=Our%20survey%20found%20that%20even,and%2012%20hours%20on%20weekends

3. https://securustechnologies.tech/about/