A scrap yard in operation may interfere with a heart device's functionality due to the presence of large, powerful magnets. These can activate a specific mode of operation of heart devices or interfere with therapy delivery, such as switching pacing modes in pacemakers or temporarily deactivating the ability of a defibrillator to deliver a shock. A site study may be necessary to determine if it is safe to work near large magnets. Contact the medical device manufacturer to learn more.