The flux follows the inverse square law, however, which means to detect if a rhino is tagged you'd have to get really close. Admittedly I don't know anything ab

The flux follows the inverse square law, however, which means to detect if a rhino is tagged you'd have to get really close. Admittedly I don't know anything about the mechanics of rhino poaching, but considering how aggressive rhinos are I imagine poachers would prefer to shoot them from a decent range for their own safety.