Any unlawful act or violation of any of the provisions of this chapter upon the part of any agent or employee of a business or trade school shall not be cause for the revocation of the certificate of approval unless it shall appear to the satisfaction of the Department that any 1 or more of the controlling officers, members or managing employees had guilty knowledge thereof.

14 Del. C. 1953, § ?8525; 58 Del. Laws, c. 544; 71 Del. Laws, c. 180, § ?190;