Countries restrict imports through quarantine controls to reduce the risks and expected costs of pest and disease incursions. Countries have also used trade barriers such as import tariffs and quotas to protect domestic industries against competition from imports. The higher benefits that could be obtained under freer trade regimes have prompted international agreements to liberalise trade under the General Agreement on Tariff and Trade (GATT) and, its successor, the World Trade Organization (WTO).

Under the WTO Agreement on the Application of Sanitary and Phytosanitary Measures, a Member has the sovereign right to determine the level of sanitary and phytosanitary protection it deems appropriate and to institute plant and animal health and food safety measures to protect against bona fide risks. Sanitary and phytosanitary measures, such as disease-free certification requirements, are instruments that importing countries use to lower the risk of pest and disease incursion. To prevent the use of SPS measures as disguised trade barriers, WTO Members can institute SPS measures provided they are:

Implementing SPS measures that meet these guidelines in a consistent manner within and between countries is proving to be difficult and several Member countries, including Australia, have been drawn into the lengthy and expensive WTO dispute settlement process. This inability to establish consistent SPS protocols may lead to a greater number of disputes in the future and reduce the effectiveness of the SPS Agreement to facilitate trade.