According to US media reports, a policy memo released by the US Citizenship and Immigration Services recently shows that the US government is resuming "neighborhood surveys" for US citizenship applicants.
The systemly requires investigators to conduct "field investigations", which may include interviews with applicants' neighbors, colleagues, etc., to determine whether the applicant meets the requirements for U.S. citizenship.
Doris Masner, who was the director of the U.S. Immigration and Naturalization Agency, said the U.S. government had basically stopped the “neighborhood investigation” because of the inefficiency, dull work and little access to useful information.