The trouble is, said a sub-inspector on condition of anonymity, while forgery can be established soon, impersonation cases are trickier, taking years together to reach closure. “Fraudsters often choose people who don’t have any identity of their own, thus making it difficult for police to trace them. This drags the case on for too long,” said the officer, adding, “That is one of the reasons why arrests are made in about five to six years after the case is taken up for investigation.” Being a document based white-collar crime, the offence should be established using documents from revenue department, sub-registrar’s office and district collectorate. “Depending on the urgency of the case, the department concerned respond to our queries and furnish the required details,” said Ponram, Assistant Commissioner (Land Grabbing-II), Central Crime Branch.