Clearly you have never traveled to Australia. They rigorously check incoming passengers for food and other undeclared organic material, as invasive species are a huge problem. Every time I've come in from an international flight in Australia, they have had trained dogs checking baggage. If the passenger had declared it, they probably would have avoided the fine entirely. Don't try to evade the rules at border crossings by lying or failing to disclose -- it's never worth it.