Is was any recent change in the US procedure to deal with cartoon porn?

[Obin]

The fifth circuit implies that a depiction must show forced hard core conduct before obscenity can even be considered.

Man Sentenced for Running Child Obscenity Website

I was unaware that an appeal had been processed. A jury convicted Thomas Alan Arthur of three counts of producing, distributing, receiving, and possessing an obscene visual depiction of a minor engaged in sexually explicit conduct, in violation of 18 U.S.C. § 1466A(a)(1); five counts of using an interactive computer service to transport obscene matters, in violation of 18 U.S.C. § 1462(a); and one count of engaging in the business of selling or transferring obscene matters, in violation…

It cannot hurt to know that “nudity alone does not render material obscene under Miller’s standards.”
Jenkins v. Georgia (1974).