Are film capacitors directional?

Operator Error? Write 'em up.

I wrote more PDRs than the law allows. (Process Deviation Report) and even dinged some supervisors who were NOT certified on the process they screwed up.

2x on the fluke.
We had one at work....model# unknown, but we had to reliably measure 8mv with several digits left over.....and this one did with great accuracy and repeatability......Our spec was 8mv +-.001