Altered and or fake ones, I've had one cross my hands and I could not tell the difference. Unfortunatelty for that person I know their employer and they told me it was a fake after I was given a heads up that said person was aparently 17 and not 19.
Saskatchewan Age Verifier! Contact for more Info.
http://airsoftcanada.com/showthread.php?t=174161 - Honour & Respect your fellow players! #Airsofthonourandrespect