Technology moves so quickly we can barely keep up, and our legal system moves so slowly it can’t keep up with itself. By design, the law is built up over time by court decisions, statutes and regulations. Sometimes even criminal laws are left vague, to be defined case by case. Technology exacerbates the problem of laws so open and vague that they are hard to abide by, to the point that we have all become potential criminals…

These miscarriages are avoidable. Under the English common law we inherited, a crime requires intent. This protection is disappearing in the U.S. As Mr. Silverglate writes, “Since the New Deal era, Congress has delegated to various administrative agencies the task of writing the regulations,” even as “Congress has demonstrated a growing dysfunction in crafting legislation that can in fact be understood.” Prosecutors identify defendants to go after instead of finding a law that was broken and figuring out who did it. Expect more such prosecutions as Washington adds regulations.