``Sensitive places should be identified in all districts, where there was a possibility of assembly of anti-social elements. Such areas should be identified with joint efforts of administration and police in towns, localities and sensitive rural areas by robust police picketing system with information of micro level” Ranjan told here during weekly review meeting on law and order front, on Saturday morning. At the time of police picketing, the police personnel should be briefed about the local information and duty should be specified to take extra care and alertness outside schools, temples, mosques, prohibition on pasting inflammatory posters on their walls and public properties, liquor shops, cinema halls, railway stations, etc. as well as stringent action should be ensured against anti-social elements.