The West Bengal CID has initiated criminal cases against 42 people after arresting them for allegedly adopting unfair means, including improvised wireless devices comprising a receiver in the shape of a credit card and an earphone, during written an examination conducted for recruitment of police constables.
"We had information that candidates in different examination centres will be using improvised wireless devices during Sunday's preliminary test for constable recruitment," a Criminal Investigation Department (CID) officer said.
The devices were hidden in the "sole of shoes and slippers" of candidates, he said.
"We have also seized micro earpieces from many candidates. These devices, if connected to a mobile phone, could be operated by accomplices outside the premises."
There could be a racket behind the illegal practice, the senior officer said.
"A racket could be running the operation from outside. The CID is making efforts to arrest all those involved in the racket," he added.
(With PTI inputs)