Immense challenges face law enforcement authorities amid continued demand for rhino horns, says WWF-Singapore’s Uma Sachidhanandam.It was sobering when I first heard of Singapore’s largest seizure of rhino horns last month - weighing in at about 34kg with an estimated price tag of S$1.2 million. The rhino horns were found in the transit baggage of a passenger travelling from South Africa to the Lao People's Democratic Republic through Singapore. It was also a reminder of another case two years earlier, where a South African man was sentenced to 17 months’ jail for trying to smuggle about 22kg of white rhino...