Rajani Pandit (54), who is said to be the country's first woman private detective, was arrested by the Thane Crime Branch officials yesterday.
She was produced before Judicial Magistrate First Class S L Gupta today.
The crime branch sought her custody, saying it needed to probe if more people were involved in the racket.
According to the police, Pandit's name had cropped up after four private detectives, arrested earlier in connection with the case, revealed her involvement.
According to the police, the case against the four was that they were illegally procuring CDRs from some persons in neighbouring Mumbai and selling them for money.
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