Earlier quoted context omitted.
That license may also require formal schooling in the amounts of many hundreds of hours of instruction as well...
But what it usually requires is an eight hour course in which you're told repeatedly that you need to sterilize combs in a solution that kills lice so you don't spread lice. Let's not pretend that licencing requirements are always some sinister cartel action to limit the number of nail-painters in a given municipality. Usually they're just a response to some obviously avoidable consequence of a large number of unlice…
I give you TN
>But after doing that for a few months, Tammy heard from officials at the state Cosmetology Board, informing her that she could not continue washing hair because she lacks a governmental license to do so. Under Board of Cosmetology regulations, an individual “must complete not less than 300 hours of instruction on the theory and practice of shampooing” at an approved school.
https://www.forbes.com/sites/georgeleef/2016/05/13/you-need-...
Here in Washington state hair design requires 1,400 hours plus 1750 hours apprenticeship. This is the equivalent of working full time for a year and a half.
Looking at a list of every US state
https://nacams.org/cosmetology-states/
How many of them require an 8 hour course?