How do you make sure that someone sick with the coronavirus stays home? As the United States begins reopening its economy, state officials are wondering whether technology being used to enforce house arrest orders could be used on coronavirus carriers. High-tech tools have been used in some cases to follow confirmed carriers over the past few weeks. But more widespread use has been held back by a larger legal question. Can officials require electronic observation without a court order or evidence of criminal activity? This question has been raised in places like Hawaii, notes Ronald Kouchi, president of the Hawaii state senate. His state considered the use of high-tech tools to enforce stay-at-home orders given to arriving air travelers. One idea was to require confirmed carriers to wear GPS-enabled devices around their arms. The other was to require those infected to equip their smartphones with tracking apps, software programs able to report their movements.