"Test them all before they pass check in."
Ah yes, reminds me of one of the best industrial campaigns I was ever a victim of.
The TAA (yes, it was a long time ago - maybe Adelaide about 1982?) cabin crew were having some kind of ding-dong with management, so they decided to "enforce safety regulations"
"No, of course we're not taking industrial action, that would be illegal. No, no, we're just making sure our high safety standards are maintained"
But, every single carry-on bag was being weighed and measured against the frame thingy. "sorry, sir, too big / heavy, we'll just pop it in the hold for you" "sorry madam, only one piece of carry-on plus your hand-bag, which ones would you like us to put down in the hold"
Absolute chaos at the gate, flight delayed massively, etc.
IIRC, TAA gave in within a week