Family Dollar

I recently went to my local Family Dollar in Dwight, IL #4022, as I was waiting in line, a customer paid and told the cashier to "keep the change". The cashier asked the next customer in line if they wanted the change, as she said she was unable to keep it. I completely understand not keeping the extra money in the register, as to keep the drawer even, but this cashier threw the money in the garbage! This is the second time I have seen this cashier throw money in the garbage! I don't care if it was just pennies! Why would you not just leave it on the counter for another customer to use? I don't know if this is a corporate policy or not but this is completely ridiculous!