Expiring NX

It's somewhat similar to expiring store credit or gift certificates.
I don't know whether these things are legal in the US, but they're fairly common around here. And very annoying.

From what I understand, it is actually now illegal in the US to have store based gift cards that expire. They used to, I remember reading the back of gift cards and there being crap like,
"For every year after the first five that this card still has value, the value reduces by 10% until it is empty" or something to that effect.

However, My coworker (whose father is a lawyer and he's going to school for law himself) said that they cannot do that anymore, but I don't know how valid that is. I never really looked it up.

Edit: Also, Debit Gift Cards (Like Visa Gift Cards or Mastercard Gift Cards), while they have an expiration date, they can be replaced with a newer one if necessary. The expiration date is like 10 years after purchase though, so I don't know how many people actually need it, however on the instruction page that comes with it and/or the back of the card it states a number that you can call to essentially renew it. I just recently got one from Secret Santa(How lazy do you need to be to do that? ><) at work and I noticed this.