Is collecting last month's rent legal

[Robert Lindsley]

Hi there,

I am getting ready to move a tenant in an apartment and for her to move in she would need first, last, and deposit.  She told me that collecting last month's rent is illegal in CT.  

Is she correct?  I've never heard of that before?  I've always thought it was standard practice.

Any help you could lend would be much appreciated!  

Thanks!
Robert.