Yes, I would include it as it is relevant retail sales experience.

I would also add a note on the application or resume that it is indeed legal just to be 100% clear to people who are viewing it.

If he is applying for jobs in the same state chances are that employers are aware of its legality, so you may or may not include it in this situation.

Yes, I would include it as it is relevant retail sales experience.

I would also add a note on the application or resume that it is indeed legal just to be 100% clear to people who are viewing it.

If he is applying for jobs in the same state chances are that employers are aware of its legality, so you may or may not include the "100% legal" statement in this case.

Yes, I would include it as it is relevant retail sales experience.

I would also add a note on the application or resume that it is indeed legal just to be 100% clear to people who are viewing it. If he is applying for jobs in the same state chances are that employers are aware of its legality, but better safe in this case.

Yes, I would include it as it is relevant retail sales experience.

I would also add a note on the application or resume that it is indeed legal just to be 100% clear to people who are viewing it. 

If he is applying for jobs in the same state chances are that employers are aware of its legality, so you may or may not include it in this situation.