Source: L. 57: p. 644, § 4. CRS 53: § 120-15-4. C.R.S. 1963: § 120-15-4. L. 89: (1) amended, p. 1133, § 80, effective July 1. L. 91: (3) amended, p. 1119, § 178, effective July 1. L. 2003: (3) amended, p. 2004, § 76, effective May 22. L. 2005: Entire section repealed, p. 291, § 48, effective August 8.