Show them the miners, and lack of growing lights.  Better yet, have a window they can peer into.

I use to have a similar concern when I raised live coral.  Coral eat light.  I had 5800 watts of metal halide lighting over my aquarium.  The profile was identical to growing pot.

I made sure the basement windows were uncovered so they could look in, and frequently invited neighbors over to see the aquarium.  e.g.  If the feds expended ANY effort prior to breaking in, they could figure out what was going on.  If they didn't, I'd sue them for incompetence.