Section $1903\mathrm{.}9($c$)$ states the following:

At the commencement of an inspection, the employer may identify areas in the establishment which contain or which might reveal a trade secret. If the Compliance Safety and Health Officer has no clear reason to question such identification, information obtained in such areas, including all negatives and prints of photographs, and environmental samples, shall be labeled "confidential$-$trade secret" and shall not be disclosed except in accordance with the provisions of section $15$ of the Act.