Aided by its small size, Singapore's contact tracing efforts were a key element of controlling the virus's spread; detectives used CCTV footage to locate the contacts of more than 6,000 people. Singapore also contacts individuals required to self-isolate several times a day and requires them to send photographic proof of their location. Breaking quarantine attracts substantial penalties, including jail terms, and in one case stripped an offender of his residency rights. Singapore also quickly…