IdScanner/Guides/Spotting a fake ID
How to spot a fake ID at the door
Most door training still teaches the hologram tilt and the fingernail-on-the-laminate test. Those catch the fakes of fifteen years ago. Here is what actually gets past a modern door — and what catches it.
The three things you are actually looking for
It helps to be precise about the problem, because "fake ID" covers three very different situations, and only one of them is a forged card.
- A forged or altered card. Someone's real licence with the date of birth changed, or a printed counterfeit. This is the one everyone trains for.
- A borrowed real card. An older sibling's genuine, unaltered licence. Nothing about the document is wrong — it simply is not theirs. No scanner on earth detects this from the card alone.
- A pass-back. One real ID used by several people in a queue: the first guest gets in, hands the card back outside, and it comes round again.
Only the first is a document problem. The second is a face problem and stays a human job. The third is a memory problem — and a phone is much better at it than a person on hour six of a shift.
Why the barcode beats the hologram
Every US and Canadian driver's licence and state ID carries a PDF417 barcode on the back. It holds the same data that is printed on the front — name, date of birth, expiry, licence number — encoded to the AAMVA standard.
That redundancy is the single most useful thing at a door, because counterfeiters optimise for what a human looks at. A cheap fake is a convincing front over a real donor card, or a printed front with a barcode copied from somewhere else entirely. Reprinting a front is easy. Making a barcode that both scans cleanly and agrees with the reprinted front is a different level of effort.
So the highest-value check is not "does this hologram tilt correctly" — it is does the back agree with the front:
- Scan the barcode and read what it says the name and date of birth are.
- Look at the printed front.
- If those two disagree, the card is bad — regardless of how good the laminate looks.
A card that does not scan at all is not proof of anything on its own: real barcodes get scratched, and worn cards fail. But a card that scans and disagrees with itself is finished.
Signals worth checking, ranked by how much they tell you
| Signal | How strong | Why |
|---|---|---|
| Barcode disagrees with printed front | Decisive | A genuine card is internally consistent. Disagreement means the front was reprinted or the barcode was copied. |
| Expired | Decisive | Not a fake, but not valid ID either — and easy to miss when you are reading a date under a strobe. |
| Same card, second time tonight | Strong | Pass-backs are the most common way a real card admits an underage guest. |
| Impossible or malformed dates | Strong | Fakes made from templates get the format wrong more often than the numbers. |
| Face does not match photo | Strong, human only | The one check no scanner should claim to make. It stays yours. |
| Card feels wrong, edges, laminate | Weak on its own | Modern counterfeits get the physical feel right. Useful as a prompt to look closer, not as a verdict. |
| Hologram / UV under torch | Weak on its own | Widely reproduced. Absence is meaningful; presence proves very little. |
The behavioural tells still matter
None of this replaces reading the person in front of you. The classics hold up because they come from the situation, not the card:
- Ask for the date of birth on the card — not the age. Someone using a borrowed licence has usually memorised the year, less often the exact day, and almost never converts to an age quickly.
- Ask the zip or postal code, or the middle name. Both are on the card and both are commonly missed.
- Watch the hand-off. A card produced from a pocket that already had it out, or passed forward within a group, is worth a second look.
- Watch the queue, not just the card. Pass-backs happen where you cannot see — the guest who steps out of line after being admitted is the tell.
Passports and non-US documents
A passport has no barcode, but it has something better: the machine-readable zone — the two lines of chevron-padded text at the bottom of the photo page, defined by the international standard ICAO 9303. That zone carries check digits: small arithmetic checksums over the document number, the date of birth and the expiry date.
That means a passport MRZ can be verified for internal consistency in a way a printed page cannot. If a check digit fails, the line has been altered or misread — and a scanner will tell you which one.
European national ID cards carry the same zone, and have been required to since 2021. European driving licences, however, carry no equivalent barcode at all — the EU standard never mandated one — so at a European door the ID card or passport is the document to ask for.
What to do when you are not sure
Refusing entry is always available and never needs to be justified with certainty. But the middle ground is worth using first:
- Scan the barcode or MRZ and check it against the printed front.
- Ask the date of birth, out loud, and compare it with what the card says.
- Ask for a second piece of ID. A borrowed licence rarely comes with a matching second document.
A note on what this page is not. This is practical guidance for door staff, not legal advice, and nothing here authenticates a document to any legal standard. What your venue is required to do — including how long you may keep records of who you carded — depends on your jurisdiction and your licence.
How IdScanner helps
IdScanner reads the AAMVA barcode or the ICAO 9303 MRZ, does the age arithmetic, and returns one word you can read across a dark doorway. The three checks above map onto it directly: the front-side check compares the printed front against the barcode or MRZ, pass-back detection flags the same ID twice in a shift, and expiry and check-digit failures are flagged automatically.
It never captures or processes a face — comparing the photo to the guest stays the doorman's job.