He said that mandatory qualification and licensing should apply retroactively.

Evidence obtained after the arrest may not apply retroactively to justify the arrest.

In the current rules for botanical nomenclature (which apply retroactively), tautonyms are explicitly prohibited.

Illegal incarcerations, fabrications, prosecutions, and intimidation were forbidden, but the provisions of the law did not apply retroactively.

The government argued that 6(b) had to apply retroactively due to the nature of ongoing investigations into reporting irregularities.