Flyingwasabi

So I just heard my friends did two challenges within a year...
apparently he created a new account, and used his flight records from another airline to request the challenge...

just wondering, has anyone ever done it?
will delta really go that deep to check your passport number? And I assume once they find out they will revoke your status right? What if they only found out 1+ years later and you have earned enough miles to qualify the next year (the normal way)?

thanks