Please explain "Neo-classical theories of crime."

Neoclassical theories of crime are something of a revision
of the classical theory of crime.

The classical theory held
that criminal acts are things that people choose to do of their own free will. Because
of this, the way to control crime is to make that choice seem unpleasant.  This was best
done through making people fear the punishment that would follow committing a crime. 
The punishment should be consistent and proportional to the crime
committed.

Neoclassical theorists essentially hold to these
ideas.  However, they understand that there are times when this classical model is
flawed.  The most important example of this is the idea that there are times when a
person does not truly have the capacity to choose to act in a given way.  Children and
people who are mentally ill fall under this category.

Thus,
neoclassical theories of crime are essentially like classical theories, with a few
adjustments to recognize that people are not always able to
choose.