Upvote:1
You have to be certain to compartmentalize your hobby and your regular life.
Have a really clean hobby environment, I assume that is most important if working with firearms and gun powder.
Clean yourself (that's a given), use nail brush for your fingers.
Make certain you use different pieces of clothing when working on your hobbies.
Make certain you properly wash both hobby stuff and non-hobby stuff in different batches.
Maybe you could get a certification with your local police that attest that you are working with gun powder ?