Every person with a Swedish national identification number must register a valid address, even if living abroad, since sent letters are considered to have been delivered to that person once they reach the registered address. As an example, Swedish astronaut Christer Fuglesang got a "Betalningsanmärkning" since a car he had ordered, and therefore owned, passed a toll station for the Stockholm congestion tax. At the time, he was living in the USA training for his first Space Shuttle mission and had an old invalid address registered for the car. Letters with payment requests did not reach him on time. The case was appealed and retracted, but the non-payment record remained for three years since it could not be retracted according to the law.