They exist, but it's illegal so nobody is gonna rat their guy.

I don't know anyone but I know they exist.

Not saying you SHOULD do this, but in my youth I'd make some parts... Modular... For inspection.

For example, I had a car horn that would randomly just start going until I pulled the battery or the fuse so I'd just pop the fuse in when it was inspection time and rip it out after it passed.