"CDR checks are primarily location checks since they reveal tower location of calls, but they also leave behind a huge trail of data.
source https://timesofindia.indiatimes.com/india/illegal-expansion-of-kerala-polices-power/articleshow/77536142.cms
source https://timesofindia.indiatimes.com/india/illegal-expansion-of-kerala-polices-power/articleshow/77536142.cms
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