Which documents notarized by the US Immigration Service are valid and which are not?

Birth notarization is valid for a long time;

Marriage notarization is also effective for a long time, unless you divorce;

No criminal record seems to be valid for 1 year;

American immigrants need to go to the physical examination hospital designated by the US Consulate General. You will receive the materials sent by the US Consulate General in China, including the physical examination form and the designated hospitals in major cities.

Generally, it is not necessary for the work unit to issue a certificate.