De acordo com a Agência de Serviços de Fronteiras do Canadá :
Many different kinds of items can introduce foreign threats into Canada. These include things as diverse as:
- Food, such as raw or cooked meats, fruit/vegetables, milk;
- Homemade articles, such as items made from plants or wood;
- Houseplants;
- Live animals, including pets;
- Firewood;
- Plant cuttings, seeds; and
- Muddy hiking boots.
...
Be sure to clean all soil and organic debris off of any items including hiking boots, vehicles, boats and gardening and construction tools/equipment.
Eles podem jogá-los fora se houver bastante lama neles para causar preocupação ao agente. Para estar seguro, apenas lave seus sapatos antes de embalá-los.