positive vetting
noun [ U ] UK uk/ˌpɒz.ə.tɪv ˈvet.ɪŋ/ us/ˌpɑː.zə.t̬ɪv ˈvet̬.ɪŋ/
（对从事保密性政府工作的人进行的）道德审查，政审
the detailed examination of a person's past, political beliefs, etc. in order to discover if they are suitable for a government job that might involve dealing with secret information