Should be fine, ldk bout most states but in Oklahoma they got a little stamp on them that expires and if so the propane shops won't refill them,
Easy fix is take them to the local shops when empty and exchange them for a full tank, place I use is local grocery store that has a cage you put your empty tank in one end, walk to other end put funds in or debit card, door opens and you remove a filled tank, not bad for $17 bucks, lots cheaper than other local stores that charge $25+ for same thing.