Well it seems according to the BLS that egg candlers in CO, no longer need a license.
Egg candlers in Colorado
Besides occupations of funeral director and PI, Colorado also has de-licensed the occupation of egg candler, citing existing regulations as an “unnecessary burden.” Eggs are generally “candled” and graded before consumption. Candling involves a candler holding eggs up to a light source to determine the condition of their yolk, white, and air sac through the shell.
Candling can be used to detect abnormalities and to monitor the growth and development of an embryo inside the egg. Colorado began requiring egg candlers to obtain a license in 1956.23 Although the production, sale, and grading of eggs are regulated in all states, only six other states besides Colorado, Georgia, Iowa, Montana, South Dakota, Tennessee, and West Virginia have issued a separate egg candler or egg grader license in addition to an egg wholesaler license.
In 1994, a sunset review by DORA of the so-called Colorado “Egg Law”—a set of statutes in which the state Department of Agriculture regulated egg handling and grading—recommended removing licensing requirements for egg candlers. The recommendation of DORA was based on the declining numbers in the occupation and the fact that egg candlers “already worked for wholesalers who had an economic interest in ensuring [that] the eggs they sell meet all standards and grades." After the review, the General Assembly of Colorado instituted the recommendations of DORA and passed them into law. Colorado has not tried to reinstitute licensing requirements for egg candler
http://www.bls.gov/opub/mlr/2015/article/the-de-licensing-of-occupations-in-the-united-states.htm