Defend or attack a law is more of a declamation than a progymnasma, more of an hypothesis than a thesis, but borrows from the thesis the attempt to argue two sides of an issue, while applying this to a specific law, real or fictional.    

Directions for Composition
Discuss the pros and cons of real, historical, or even fictitious laws. Use the following headings:

• legality
• justice
• expediency
• practicability
• decency
• consequences

Example
Apthonius provides the example of opposing a law that requires an adulterer, taken in the act, to be killed.

Related Topics of Invention

• Laws

• Deliberative oratory

Sources: Quintilian 2.4.33-40