Something to think about!!
This is pretty good info. Never even thought about
key cards containing anything other than an access code for
the room!

Ever wonder what is on your magnetic key card?  
  a. Customer’s name    
B. Customer’s partial home address    
c. Hotel room number    
d. Check-in date and out dates    
e. Customer’s credit card number and expiration
When you turn them in to the front desk your
personal information is  there for any employee to access by simply scanning
the card in he hotel scanner. An employee can take a hand full of
cards home and using a scanning device, access the information onto
a laptop computer and go shopping at your expense.
Simply put, hotels do not erase the information on
these cards until an employee reissues the card to the next hotel
guest. At that time, the new guest’s information is electronically
“overwritten” on the card and the previous guest’s information is erased
in the overwriting  process.   
But until the card is rewritten for the next guest, it usually is kept   
in a drawer at the front desk with YOUR INFORMATION ON IT!
The bottom line is: Keep the cards, take them home with you, or  
destroy them. NEVER leave them behind in the room or
room wastebasket,  and NEVER turn them into the front desk when you
check out of a room.
They will not charge you for the card (it’s illegal) and you’ll be sure you are not leaving a lot of valuable personal information on it  that could be easily lifted off with any simple
scanning device card reader.
For the same reason, if you arrive at the airport and discover you  
still have the card key in your pocket, do not toss it in an airport   
trash basket. Take it home and destroy it by cutting it up, especially  
through the electronic information strip!   
If you have a small magnet, pass it across the magnetic strip several  
times. Then try it in the door, it will not work. It erases everything  on the card.     

PLEASE FORWARD to friends and family