Many countries have laws to prevent the intentional introduction of invasive species. In the United States, the introduction of alien species is regulated by the USDA Animal and Plant Health Inspection Service, and the movement of species across international boundaries into the US is highly regulated. Laws vary from country to country. A good source of information on the restrictions for the movement of organisms between countries is given on the website of The International Portal on Food Safety, Animal and Plant Health (http://www.ipfsaph.org/).
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