A USI can be validated against the government verification service.
Database value: 0
The USI has not been entered at all.
Database value: 3
A student objected to having a USI and obtained an exemption.
Database value: 4
A student did their training offshore and isn't required to get a USI
Database value: 1
A verification was attempted, but it failed.
Database value: 2
A verification was made and succeeded.