Prohibited imports include habit-forming drugs and obscene literature (pornographic magazines and videotapes). Importation of certain agricultural products and plants requires approval from the Ministry of Agriculture before obtaining an import permit from the Department of Trade and Consumer Affairs. Imports of fresh pork and beef are banned; import permits are granted only on processed pork products. Poultry imports are permitted only in the uncommon event that there is a domestic market shortage. Imports of some vegetables, meat, and dairy products are seasonally banned.