Toxins, chemical substances produced by practically all forms of life, represent a chemically broad group of compounds. Many of them are very toxic for human and represent a serious jeopardy because they may be misused through chemical warfare or terrorist attacks. This danger has been increasing recently because toxins are more and more available due to modem synthetic methods and application of genetic engineering. Therefore the international community adopted multilateral conventions and control regimes, which regulate handling with toxins. These fundamentals are implemented finto the Czech system of law too.

        Key words: toxin - biological weapons - convention - control regime - act