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The CAST/CASTViz repository describes the program as a specialized data visualization engine. It handles Call Detail Records (CDRs) and tower data provided by cellular service providers. When law enforcement subpoenas a suspect’s or victim's phone records, they receive massive CSV or Excel sheets detailing thousands of connections, timestamps, and cell tower IDs.

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Creates specialized 2D and 3D maps of cell site locations and call records. Exports data to formats like for further analysis in Google Earth Pro.

If you found this deep dive into the world of CASTViz interesting, what other topics in digital forensics or law enforcement technology would you like to see explored?

The practical value of CASTViz is perhaps best illustrated by a real case. In State v. Sutton , a detective received call records for two phones belonging to a suspect in a drug investigation. Using CASTViz, the analyst plotted every call and its associated tower location. The resulting maps showed that between 2:00 p.m. and 6:00 p.m., one phone traveled from Toledo to the area of a known co‑defendant’s residence and then returned to Toledo—exactly aligning with witness accounts of a drug buy. The maps were admitted as evidence and helped secure a conviction.

Analysts use the software to discover patterns, such as multiple burner phones pinging the same towers or identifying surveillance cameras near a suspect’s mapped location. 4. Seamless Data Exporting

One of the biggest challenges in cellular analysis is the varying data formats provided by different telecom carriers (e.g., AT&T, T-Mobile, Verizon). CASTViz is designed as a versatile tool that can import and interpret records from multiple providers. As noted in FBI training documents, CASTViz can process raw text CDR files and export them from cell site databases, simplifying what was once a tedious manual process.

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The curriculum covers:

When detectives obtain CDRs from a carrier (via subpoena or warrant), CASTViz converts the raw logs into a visual timeline of the device’s approximate location. In one drug trafficking case, a criminal analyst used CASTViz to map calls from a suspect’s phone, showing that the device moved from Toledo to Fostoria and back within a four‑hour window—corroborating witness statements about a drug transaction. The resulting maps were admitted as evidence at trial.