450.095  Waivers.--In extenuating circumstances when it clearly appears to be in the best interest of the child, the department may grant a waiver of the restrictions imposed by the Child Labor Law on the employment of a child. Such waivers shall be granted upon a case-by-case basis and shall be based upon such factors as the department, by rule, establishes as determinative of whether such waiver is in the best interest of a child.