The regulations shall prescribe the time when, and the conditions under which, a restricted material may be used or possessed in different areas of the state, and may prohibit its use or possession in those areas. This usage shall be limited to those situations in which it is reasonably certain that no injury will result, or no nonrestricted material or procedure is equally effective and practical. They may provide that a restricted material shall be used only under permit of the commissioner or under the direct supervision of the commissioner, subject to any of the following limitations:
This section shall become operative on January 1, 1991.
Ca. Food and Agric. Code § 14006