Section 874. When employment prohibited

(a) No employment under the work
  release program for any prisoner shall be approved if:
    (1) it is ascertained by the sheriff that such employment will  result
  in the displacement of employed workers, or be applied in skills, crafts
  or  trades  in  which  there  is  a  surplus  of  available labor in the
  locality, except in the case of a prisoner who is to be employed  by  an
  employer  for  whom  he  was  employed  as  a  free  person prior to the
  commencement of his sentence, and;
    (2) the rates of pay and other conditions of  employment  are  not  at
  least  equal  to  those paid or provided for work of a similar nature in
  the locality in which the work is to be performed.
    (b) The state department of labor shall exercise the same  supervision
  over  conditions  of  employment for prisoners participating in the work
  release program as such department does over  conditions  of  employment
  for free persons.
    (c) In no event shall any work release program be permitted when there
  is  any  labor  strike  or  lock-out  in  the establishment in which the
  prisoner is, or is to be, employed.