Some hotels control this tight, Im not sure if its only certain corp rates or in general, however this is the mail PH Shanghai send to employees of Louis Vitton;

Greetings from Park Hyatt Shanghai.

We are pleased to note you have a future reservation on xxxxxx, 2010 made through hyatt.com. I do kindly ask that you bring your valid working ID in order for us to be able to confirm the corporate rate at time of check-in which will be cross referenced with the company. Unfortunately of late we have been experiencing misuse of some of our corporate rates, with your company a target and we have had to implement tighter controls in this regard.

I greatly appreciate your understanding and support and look forward to welcoming you to our hotel.