Adjunct professors sued USF for failing to give them wage statements that showed hours worked and hourly wage. After judgment was entered in Gola’s favor, the Legislature enacted Lab. Code 515.7 which allows nonprofit universities to avoid certain wage statement requirements if the adjunct professors’ wages meet certain criteria. This decision holds that section 515.7 does not operate retroactively to immunize USF from liability for improper wage statements issued before section 515.7 became effective. Nothing in the statutory language indicates any intent to have the statute apply retroactively, the legislative history and purpose are not so clear as to compel retroactive application. The abatement doctrine does not apply because section 515.7 does not abolish the cause of action under Lab. Code 226, but merely places certain conditions on its aplication. Finally, USF cannot obtain reversal on the ground its improper wage statements were not “knowing and intentional.” The trial court correctly found that USF knew the facts showing its wage statements were improper. Its legal mistake, even if in good faith, was not a sufficient to show the violation (as to a whole class of employees) was not knowing and intentional. That exception is intended for one-off mistakes, not programmatic errors.