Defense attorneys, some Prosecutors, many Judges, a lot of legislators, and folks who write the rules can't seem to grasp the concept of strict liability and want the officer to prove that the violator was committing the act knowingly, willfullly, or negligently.

A snagging rule should be straightforward. Most of the laws should be written as strict liability - either you're committing the violation or you're not. If you commit the crime, you pay the penalty and face license suspension.