Source: L. 64: p. 613, § 30. C.R.S. 1963: § 123-31-30. L. 74: Entire section amended, p. 371, § 8, effective March 21. L. 77: Entire section amended, p. 280, § 26, effective June 29. L. 80: Entire section amended, p. 439, § 4, effective January 1, 1981. L. 92: Entire article amended, p. 835, § 31, effective January 1, 1993.