In early 2013, the Indian Ministry of Environment and Forests issued a circular banning the use of these "government servants". The Ministry of Urban Development was trying to get it implemented in New Delhi, where these are primarily used.
Who are these 'government servants'?
From my India Quiz at IIT Kanpur
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Buildings in New Delhi, especially government buildings, are particularly plagued by monkeys who are known to run amok. To counter them, langur monkeys have been trained to scare them away and have been used for many years. The practice has been somewhat officially sanctioned, but after protests by environmental activists, this has been put an end to.
More here.