My Realtor wants to copy my Drivers License

[Christine Shay]

I'm not opposed to proving I'm a real person by showing a government issued picture ID, but I am against giving an agent a copy of my driver's license or passport to keep on file. It's not required in my state as far as I know (NC). 
This isn't for financing, which I understand is a requirement.
The agent said her "firm requires" it which may be true, but that doesn't make it a legal requirement. 
Thoughts on this and how to handle it?