Biosensors for the express control of the total toxicity of environmental objects, revealing of group toxic elements and individual toxins among them are presented. Among the individual toxins, primary attention is paid to mycotoxins, in particular, fumasine, atrazine and T2. T2 is considered as a potential specimen for bioterrorists' activities. Ways to decontaminate polluted environmental objects from different types of low molecular weight toxins are presented. More especially, the possibility of using some calyx [4] resorcinol arenas for specific binding of the number of mycotoxins and pesticides is discussed. This possibility is analyzed from two points of view: the application of calix [4] resorcinol arenas for the removal of toxic substances and the creation of the artificial sensitive layer of sensors revealed by the instrumental analytical devices in the express and on line regime. Both approaches provide practices demanded for the prevention of non-desirable consequences from bioterrorists' activities.