A principal element for conviction under the Act is proving a violation of the Act was intentional, i.e. knowing and willful. In the opinion of legal experts, this is almost impossible to prove unless there is evidence of a prospective defendant knowing about his obligation to register and intentionally choosing not to do so. Or, for example, when there is evidence the government at any time provided notice to the prospective defendant to register or report for induction, he was given an opportunity to comply, and the prospective defendant chose not to do so.