Used Car Seat?

I had a garage sale today, along with a few neighbors, and checking out some of their stuff reminded me about something I wanted to look into. Is it okay to buy used car seats for your infant, toddler, or child? I found a great article on About.com about this:

Thrifty parents often ask whether it's OK to purchase a used car seat from a garage sale or an online auction. While a used car seat might be save dollars, it could also compromise safety. Steer clear of used car seats unless you can verify the age and crash history of the seat, and can use the model number to verify that the seat is not under recall. It's also tricky to determine whether used car seats still have all of the original parts needed for safety.

Each manufacturer sets the time til expiration for their car seats. Some manufacturers even put an expiration date on one of the labels. Check the date of manufacture, which must be on one of the seat labels by law. Most car seats expire 6 years from the date of manufacture, unless there is a different expiration date marked on the seat. If you're not sure, call the manufacturer. If the labels are missing from the car seat, it's best not to use it, as the labels would also give you important model information that would alert you to potential recalls.

If you cannot verify all of those things, the car seat is considered unsafe for use, even if it appears to be in good condition. Crashes can cause stress and structural weakness that isn't visible from the outside, and older car seats can be weakened by many seasons of heat and cold in the car. Unless a used car seat is coming from a close friend or family member and meets the above criteria, it is almost always safer to choose a new car seat for your baby.