I might be offered a position as a software developer at a company that produces software for the cannabis industry. My son is an officer in the Navy and has security clearance. I'm wondering if me taking a job in this industry would have repercussions for him. I live in Washington state where recreational cannabis is legal, but it is still considered illegal at the federal level, so I'm not sure what that means as far as it concerns my son's clearance.
I believe that if your son has a security clearance, then there should be a person responsible for handling that clearance, and that person should be able to answer such questions. Or questions like "I want to go on holiday to China / South Korea / North Korea, will that affect my clearance".
Most things that might affect a security clearance are not either Ok or lead to loss of clearance, there might be things that speak against your sons clearance but are fine if there are not too many. That person might know that your son is either perfectly clean, or very close to not getting a clearance, so the same thing might be fine in one case and not fine in the other case. (For example an uncle who is a suspected drug dealer may be fine on its own, dad working in the cannabis industry may be fine on its own, but both together might lead to loss of clearance - hypothetical example).
Probably not, but there is a slim chance it could.
How close are you? Does he live in your home? Does he provide financial support? All of these things will be contributing factors in the decision.
If he already has a clearance it will be much less of an issue.
Another thing to consider, working for a software developer may be far enough removed from the actual cannabis industry that it won't be a problem.
I'm going to say it largely depends. If you look at past historical cases, http://ogc.osd.mil/doha/industrial/2018.html you can see that sometimes the parent or family member's association affects the clearance. Especially if the parent is potentially associated with bad countries or bad actors.
Generally speaking though, what your family does won't affect your clearance unless it raises a doubt. One of those will be how much he interacts with you.
It's impossible to give you a sure answer, though. However, common sense, if cannabis is legal in your area, and you're operating legally, then you are not committing a crime. However, at the federal level, cannabis is considered illegal, even medical cannabis.