Screening.

It is not as easy to lie about your identity to the
high class indies as you think. Screening process
you have to go through might require you to provide
proof of your id like your passport and proof of
employment. It is possible to create a false
identity but that is a criminal act.
 
Actually a fake drivers license is incredibly easy to make (esp if just sending pic through an email, printing is a bit harder but still simple these days)
Proof of employment is even easier to fake

False ID is only a summary conviction anyways
And do you really think an Indy is going to bother going through the long trial anyways?