How long are wheelchair rental passes good for?

[Mom21]

I bought 3 days this week, but we only used 2. If I keep the other ticket does it have an expiration date on it? I don't see one. However the other 2 passes are stamped for the days we used. Empty one just says void after each day's use.

 

[brittsmum1998]

You may want to post this over on the DISabilities board.