What do you mean by extraordinary diligence under the law?

Answer 1

It means that there must be utmost human care. It is a higher standard of care. A person accused of a crime that requires this standard is easily convicted since his only defense would be fortuitious event or event which can't be avoided

Answer 2

Extraordinary diligence means that it is more than the diligence of the good father of a family in the transport or custody of goods. It is taking good care or custody of the goods beyond those of others.