You can easily find and order fake IDs on the internet.
So how do you detect them?
As a notary, you should be familiar with the most commonly used IDs. EG: Passports, State IDs.
But for out of state IDs, its advisable to call 800-USNotary.
The signature should be similar on the ID, document and notary journal.
Check for card wear, raised area around the photograph, smudges, erasures, styles of typewritten info.
If fraud is suspected and danger may be present, proceed with the notary, then call the police.