I feel the standards for mycotoxin are placed on statistical work and field experience in each of the composed states in the USA and all the EU reporting cases. Standards are just adopted for internal purposes of grain acceptance by receivers and exporters. As you know ithe Tates we can reject a truck with 20 PPB of Aflatoxin, but in other Central and Asian countries, they need to accept what they get and blended with lower toxin grade coarse grain.
Sometimes, we find ourselves also that regulated standards are not for the toxins that most damage our chickens or pigs, but rather toxins that are more handful due to the local conditions.
This is my opinion and through more than 25 years in the field is a logic situation to find totally contrary situations from standards to field situations.