The following is excerpted from the definition of practice of engineering in the Oklahoma statute:
"...any of which embraces such services or work, either public or private, in connection with any utilities, structures, buildings, machines, equipment, processes, work systems, projects, ....". [underline by me]
And further in that paragraph:
"...insofar as they involve safeguarding life, health or property..."
Notice it doesn't say public life. The safety of employees is also of concern.
What do your state's regulations say on this matter?