These are the easiest laws...namely because they are strict liability laws[1], if pictures exist there is guilt notwithstanding intent which is the common standard in US criminal law.

Take a dead body, that could be murder( 1st degree, 2nd, 3rd), manslaughter or even a lawful killing (self defense). But as you will see in the link below even receiving a text can lead to conviction even if you receive it in error and report it.

[1]https://www.ussc.gov/sites/default/files/pdf/news/congressio...