The winner may be required to submit valid identification before receiving their prize.

These details were then printed on the event tickets and valid identification was required to gain admission into the festival.

In the past there have been certain groups that have experienced problems obtaining valid identification documents.

In addition, a valid identification document has to be produced to the hotel manager or staff.

By repeating the immunoprecipitation in this way, the researcher verifies that each identified member of the protein complex was a valid identification.