This is always going to happen with these types of laws, because they can be broken with very little effort from anywhere. That directly causes it to be easy to frame people for breaking them, by accident or on purpose. If the crime is purely the transmission of the incorrect byte pattern, the evidence is always logs, server and local. Eventually a bug will lead them to people who did not transmit the wrong bytes, but they will just assume they wiped the evidence from their local storage. There is no other evidence to be had because the crimes in this category to not require any physical evidence whatsoever. Many of the laws in this category involve byte patterns with a sexual theme, but not all of them. Others include the laws against using the wrong REST API in the wrong way (unauthorized access) or speech restrictions including laws against empty, impossible, never acted on threats or improper ideas (popular outside the US).