Yes. However, the general recommendation is that you calibrate your BACtrack every 12 months or more. However, with proper use and care, we have seen our devices maintain their accuracy for much longer than that.
It really depends on the performance of the device - if you notice that something is strange, it's probably time to calibrate it. Otherwise, if you don't see any drop in performance within a year, there is no need to send it to the factory yet.