In the case The State of Tennessee v. John Thomas Scopes, high school biology teacher John Scopes was accused of teaching content that violated a Tennessee law called the Butler Act. The Butler Act was a Tennessee law that stopped public school teachers from teaching evolution. Scopes violated this law but felt his right to free speech protected him.

What variety of law could Scopes use in his defense?

a Constitutional law
b Civil law
c Criminal law
d Military law