Nothing in this article shall prevent or prohibit the use of the check-off between employers or employees in the custom or practice of the deduction of union dues by an employer for his employees where such an arrangement has been entered into between the parties.
Source: L. 49: p. 232, § 6. CSA: C. 97, § 235(1). CRS 53: § 80-11-6. C.R.S. 1963: § 80-15-6.