"Amin's suspension has been revoked and he has been appointed in the SCRB as DySP today," a senior Home Department official said.
Amin was granted regular bail by the Special CBI Court on May 8 on the grounds of his worsening health and parity with other co-accused.
The Special CBI court allowed Amin's bail application on medical grounds since he suffers from prostate cancer and also on the basis of parity with co-accused IPS officers D G Vanzara and P P Pandey, who were granted bail in February.
Earlier, Pandey was reinstated by the Gujarat state government as Additional Director General of Police (ADGP), Law and Order, after he was granted regular bail.
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Amin was the DySP in the Special branch, when the alleged encounter took place on June 15, 2004, on the outskirts of the city.
In the encounter, a Mumbra-based 19-year-old college girl Ishrat Jahan, her friend Pranesh Pillai alias Javed Sheikh along with two suspected Pakistanis Amjad Ali Rana and Zeeshan Johar were gunned down by city crime branch officials.