Maybe your Engineer is just trying to discourage user staff from bringing in cheap, nasty rubbish.

And quite right too.

Meanwhile, I encourage you to confiscate any such junk you encounter when doing your rounds, and dumping same on the Engineer's desk (thereby affording him the pleasure of chucking it in the bin).

Meanwhile, in your spare moments, I urge you to read up on whichever Standards apply in your jurisdiction.

If you don't inspect ... don't expect.