Trick:
Just a side note..
Many years back, I installed a gray, old work, deep, plastic box in a bathroom for a GFI.
My GC called, said I failed rough inspection. I went to the site, found a red sticker in the bath 'box not bonded'!
I called the town, spoke to the inspector, told him 'it's plastic'! He said...it's not blue, it's metal, bond it!!
After some thought, I drilled and tapped the back of the box and installed a green screw & bond. IMHO, it was not worth delaying the job to prove a point.
